TTL/Bipolar PROM and RAM Reference Guide booklet V5 - print version Also a few old CMOS PROMS. TS = Tri-State output OC = Open Collector output

Transcription

1 TTL/Bipolar PROM and RAM Reference Guide booklet V5 - print version Also a few old CMOS PROMS Added some modern PROM-pin and -speed compatible CMOS EPROM types, also some military versions, which use a combined NiCr fuselink and CMOS technology. TS = Tri-State output OC = Open Collector output To be compatible with the rest of the world: databits OUT now start with D0 (D-zero) and not anymore with O1 Hacked, copied, edited and extended by PE1ABR to give it a decent shape and handy booklet form. The main part is extracted from and in detail: from the text part about the Bipolar PROMs List See also old reference info at: and the info at Updated with info from: and also take a look at: 1

2 32*8 = 256 bit NEC Fujitsu Intersil Mitsubishi OKI D Vcc D /CE TS upb410 MB7051 IM5610 M54730 MSL8215 D A4 MB7112 D A3 D A2 OC upb400 MB7056 IM5600 MSL8216 D A1 MB7111 D A0 GND 8 9 D7 Signetics MMI TI Harris Raytheon AMD National Intel TS 82S123 (50ns) TBP18S030 HM AM27S S123A(25ns) 63S AM27S19AC 74S288-63LS081 AM27S09 AM27LS09 DM8577 OC 82S23 (50ns) TBP18SA030 HM AM27S S23A(25ns) 63S AM27A18AC 74S188-63LS080 AM27S08 AM27LS08 DM8578 Mask programmed custom ROM version: TS= 74S88 2

3 An old military SPECIAL 64*8 = 512 bit N.C Vcc N.C GND2 A D0 A D1 A D2 CE D3 CE D4 A D5 A D6 A D7 GND N.C. Do not connect INTERNAL GND2 Harris Landsdale AMD National Intel HMx-0512-x HL JAN

4 256*4 = 1024 bit NEC Fujitsu Fairchild Intersil Mitsubishi A Vcc A A7 TS upb423 MB IM5623 M54700 A /CE2 MB7114 A /CE1 A D0 OC upb403 MB IM5603 A D1 MB7113 A D2 GND 8 9 D3 Signetics MMI TI Harris Raytheon AMD National Intel OKI TS 82S129 (50ns) TBP24S10 HM S21 74S MBL8521A 82S129A(27ns) 63S141 TBP34S10 HM7611A - 27S21A - 82S27 27S11 OC 82S126 (50ns) SA10 HM S20 74S MBL8520A 82S126A(30ns) 63S140 - HM7610A - 27S20A S10 Mask programmed custom ROM version: TS= DM7597 / DM8597 / SN74S187 / 82S229 OC= 82S226 4

5 VERY RARE CMOS PROM 256*4 = 1024 bit A Vcc This is NO Bipolar PROM A A4 But a TTL compatible CMOS PROM with polysilicon fuses A /prog A /CE A D3 A D2 Pinout compatible with CMOS SRAM HM-6562 A D1 GND 8 9 D0 Harris TS HM

6 256*8 = 2048 bit NEC Fujitsu A Vcc A A7 TS upb421 MB7118 A A6 A A5 OC MB7117 A /CE1 D /CE2 D D7 D D6 D D5 GND D4 Signetics MMI TI Harris Raytheon AMD National Intel TS 82S135 (45ns) TBP18S AM27S23 DM74S471-82LS135(100ns) - TBP28L DM74LS471-63S281 TBP38S22 DM87S221 63LS281 SN74S471 SN74S571 OC SN74S DM74S470 63S280 DM74LS470 63LS280 TBP38SA22 DM87S222 Mask programmed custom ROM version: TS= SN74S371, OC= SN74S27 6

7 SPECIAL PINNING VERSION 256*8 = 2048 bit A Vcc A NC A NC A /CE0 A /CE1 A CE2 A CE3 A D7 D D6 D D5 D D4 GND D3 Signetics MMI Harris Raytheon AMD National Intel TS HM OC HM

8 SPECIAL PINNING VERSION 256*8 = 2048 bit A NC!! A NC A NC D A3 D A4 D A5 D A6 D A7 D Vcc!! D NC D /CE0 GND /CE1 Signetics MMI TI Harris Raytheon AMD National Intel TS

9 256*8 = 2048 bit (latched) A Vcc A A2 NC 3 22 A1 A A0 A /CE1 A CE2 D STROBE D D7 D D6 D D5 FE D4 GND FE1 Signetics MMI TI Harris Raytheon AMD National Intel TS 82S114 (60ns) Mask programmed custom ROM version: TS= 82S214,

10 512*4 = 1024 bit FSC NEC Fujitsu Fairchild Intersil A Vcc A A7 TS upb412 MB IM56S24 A A8 MB7116 IM5624 A /CE A D0 OC MB IM56S04 A D1 MB7115 IM5604 A D2 GND 8 9 D3 Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S131 (50ns) HM AM27S13 DM74S S131A(30ns) 63S241 HM7621A AM27S13A DM74S571A 3622A 63LS241 MCM7621 OC 82S130 (50ns) HM AM27S12 DM74S S130A(33ns) 63S240 HM7620A AM27S12A DM74S570A 3602A 63LS240 MCM7620 Mask programmed custom ROM version: TS= 82S231 / SN74S370 OC= 82S230 / SN74S270 10

11 512*8 = 4096 bit NEC Fujitsu A Vcc A A8 TS upb424 MB7124 A A7 A A6 OC MB7123 A A5 D /CE D D7 D D6 D D5 GND D4 Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S147 (60ns) TBP28S42 HM ? DM74S472-82S147A(45ns) TBP28L42 HM7649A A AM27S29 DM74S472A - 82HS147 TBP18S S147AN/BN 63LS481 OC 82S TBP28SA42 HM AM27S28 DM74S LS480 11

12 512*8 = 4096 bit A Vcc (NC for 3604) A A8 NEC Fairchild Fujitsu Intersil A NC (Vcc for 3604) A /CE1 TS upb MB7126 IM5625 A /CE2 A CE3 OC upb IM5605 A CE4 A D7 D D6 D D5 D D4 GND D3 Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S141 (60ns) TBP28S46 HM AM27S31 DM74S S483 SN74S474 MCM S296 63S485 OC 82S140 (60ns) 6340 TBP28SA46 HM AM27S30 DM74S S482 SN74S475 MCM S295 12

13 512*8 = 4096 bit (latched) A Vcc Registered / latched PROM A A2 A A1 A A0 A /CE1 A CE2 D STROBE D D7 D D6 D D5 FE D4 GND FE1 Signetics MMI TI Harris Raytheon AMD National Intel TS 82S115 (60ns) O - 27S R Mask programmed custom ROM version: TS= 82S215,

14 512*8 = 4096 bit (latched) A Vcc NO BIPOLAR, but EPROM CMOS registered/clocked PROM A A8 A /Set Added to be complete... A /OE A /Clr A /ES A Clock A D7 D D6 D D5 D D4 GND D3 Cypress TS CY7C225A (25 / 12 ns) 14

15 VERY SPECIAL LATCHED VERSION 512*8 = 4096 bit (latched) This is a PROM, but NOT a TTL Bipolar version It does have the same internal programming technology A Vcc = NiCr fuse cell s and NO EPROM cell s A A8 Interfacing = NOT bipolar, but very low power CMOS A /CE1 Military (handheld) application!! A /CE2 A CE3 Registered / latched (synchronous) PROM A /Clock Clocked address-in as data-out A PGM / GND A D7 MIL-STD/882 VERSION D D6 HM1 = Mil (wide) D D5 HM6 = Mil (slim) D D4 HM4 = CLCC GND D3 B = faster Signetics Intersil Harris Raytheon AMD Intel TS - HM1-6642/ HM1-6642B/ HM6-6642/ HM6-6642B/ HM4-6642/ (or HM-6642 ) 15

16 1024*4 = 4096 bit FSC Intersil NEC Fujitsu Fairchild Mitsubishi Sharp Hitachi A Vcc A A7 TS upb426 MB M54741A IM56S26 HN25045 A A8 upb426-1 MB7134? LH5626 A A9 upb426-2 MB7054 A D0 A D1 OC upb406 MB M54740A IM56S06 HN25044 A D2 upb406-1 LH5606 /CE D3 upb406-2 MB7059 GND 9 10 /CE2 Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S137 (60ns) TBP24S41 HM S33 74S S137A(45ns) 63S441 - HM7643A S573A - 82S137B(35ns) 63S441A - HM7643B-5-27S33A 74S573B - MCM7643 OC 82S136 (60ns) TBP24SA41 HM S32 74S S440 MCM7642 ( Signetics 8228 is a NON compatible custom ROM [1024*4] version with only 16 pins, no /CE pins, GND shifts to pin 8, further identical pinning sequence) 16

17 1024*8 = 8192 bit NEC Fujitsu Fairchild Hitachi Cypress Intersil A Vcc A A8 TS upb428 MB HN25089 CY7C281 IM5618 A A9 MB Z451 (EPROM) A /CE1 93L451 A /CE2 OC upb408 MB HN25088 IM5608 A CE3 93Z450 A CE4 93L450 A D7 D D6 D D5 D D4 GND D3 Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S181 70ns TBP28S S181 74S A 82S181A 55ns S A 29631A 27S181A 87S181-82S181C 30ns 63S S181A - (24S86?) OC 82S180 70ns SA S180 74S S880 HM7680P-5 87S180 also C/LS Mask programmed custom ROM version: TS= 82S281 / 27S281? (custom version probably NO inverse CE1, CE2??) OC= 82S280 / 27S280? 17

18 SPECIAL VERSION 1024*8 = 8192 bit A Vcc This Prom 82S2708 is a much faster 2708 EPROM replacement A A8 A A9-5, +12 and Vpp NO internal connection A NC A /CE A NC A NC A D7 (NEC PROM upb419 and Harris HM7616 are D D EPROM replacements) D D5 D D4 GND D3 Signetics TI NEC Harris Fairchild Motorola Raytheon S2708 TBP28S2708 upb417 HM C MCM82708C MCM82707 MMI Fujitsu MB7055, MB MB7153L, MB7154L 18

19 This is NO TTL Bipolar PROM - SPECIAL LATCHED EPROM VERSION 1024*8 = 8192 bit A Vcc This PROM is CMOS UV erasable EPROM replacement A A8 Addresses and data are internally LATCHED with /E A A9 A P A /OE A Y A /E It allows upgrading to a HM-6716 (double sized) EPROM A D7 D D6 D D5 D D4 GND D3 This HM-6758 device is NOT equal, but comparable with the Intel 2758 EPROM. The Intel device is static, it has NO latched feedthrough, 18=/CE, 20=/OE EPROM 2758 is comparable with the standard 2716 Intel Harris TS (2758) HM-6758H Y = Vcc HM-6758L Y = Gnd 19

20 SPECIAL 1024*8 = 8192 bit A Vcc A A7 A A8 A A9 A /CS0 A /CS1 A D7 D D6 D D5 D D4 GND D3 Fujitsu MMI TS MB OC?? MB

21 SPECIAL 1024*8 = 8192 bit A Vcc A A8 A A7 A A6 A A5 D A9 D D7 D D6 D D5 GND D4 Harris TS HM OC?? 21

22 1024*8 = 8192 bit (latched) A Vcc Registered / latched PROM A A8 A A9 A /CE1 A /CE2 A CE3 A STROBE A D7 D D6 D D5 D D4 GND D3 FSC Signetics Harris Fairchild TS 82S183 (60ns) 7681R-5 93L451 = 22

23 VERY SPECIAL LATCHED VERSION 1024*8 = 8192 bit (latched) This is a PROM, but NOT a TTL Bipolar version A Vcc A A8 This device is a PROM with EPROM technology A A9 A /OE A /INIT A /ES A Clock A D7 D D6 D D5 D D4 GND D3 Cypress CY7C235A 25 / 12 nsec 23

24 2048*4 = 8192 bit NEC Fairchild Fujitsu Hitachi A Vcc A A7 TS upb MB7128 HN25085 A A8 HN25085S A A9 A D0 OC MB7127 HN25084 A D1 HN25084S A D2 A D3 GND 9 10 /CE Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S185(100ns) MCM S185A(50ns) 63S841 TBP24S A 27S185 87S185-82S185B(45ns) - 24S LS185 87S185A - OC 82S184(100ns) 6388 TBP24SA81 MCM S184 87S184-63S LS184 24

25 SPECIAL PINNING 2048*4 = 8192 bit A Vcc A A8 A A9 A A10 A D0 A D1 A D2 A D3 GND 9 10 /CE Harris TS HM OC HM

26 SPECIAL VERSION 2048*4 = 8192 bit A Vcc A A8 A A9 A A10 A D0 A D1 A D2 A D3 /CE /CE1 GND /CE2 Harris Motorola HM MCM7686 HM

27 2048*8 = bit FSC NEC Fairchild Hitachi Fujitsu Cypress A Vcc A A8 TS upb P HN25169 MB7138 CY7C292 A A9 upb Z511 CY7C292A A A10 upb429-2 MBH38 ( EPROM s ) A /CE1 (EPROM?) (CY7C291 A CE2 OC upb HN25168 MB7137 CY7C293) A CE3 upb Z510 A D7 upb409-2 D D6 D D5 ST D D4 WSI Sharp Thomson GND D TS WS57C191C (fast EPROM version) LH57191 JBP38S165 WS57C291C (fast EPROM version) Motorola Signetics MMI TI Harris Raytheon AMD National Intel TS 82S191(80ns) - 28S S B 82S191A(55ns) 63S S A 29681A 27S191 /291 87S191A - 82S191C(35ns) - 38S S191A 87S291 - (EPROM?) 87S193 OC 82S190(80ns) 63S SA S190 87S S290 27

28 SPECIAL VERSION 2048*8 = bit A Vcc A A8 A A7 A A6 A A5 D A9 D D7 D D6 D D5 A D4 GND /CE Fujitsu TS MB7136 OC MB

29 SPECIAL VERSION 2048*8 = bit A Vcc A A8 A A9 A NC This prom is a much faster 2716 EPROM replacement A /CE A A10 A NC A D7 (NEC PROM upb417 and Harris HM are D D EPROM replacements) D D5 D D4 GND D3 Harris NEC HM upb419 29

30 VERY SPECIAL LATCHED VERSION 2048*8 = bit (latched) A Vcc A A8 A A9 A A10 This prom device looks like a registered ( = LATCHED ) A /INIT 2716 EPROM replacement 10x faster A /OE But PIN A10 DIFFERENT! A Clock A D7 D D6 D D5 D D4 GND D3 Waferscale Integration Inc AMI WSI Cypress TS AM27S45 WS57C45 CY7C245 CY7C245A (PROM-speed compatible EPROM versions) 30

31 VERY SPECIAL LATCHED VERSION 2048*8 = bit (latched) This is a PROM, but NOT a TTL Bipolar version It does have the same internal programming technology A Vcc = NiCr fuse cell s and NO EPROM cell s A A8 Interfacing = NOT bipolar, but very low power CMOS A A9 Military (handheld) application!! A /PGM(Vcc) A /CE Registered / latched (synchronous) PROM A A10 Clocked address-in as data-out A /Clock A D7 MIL-STD/882 VERSION D D6 D D5 D D4 GND D3 Signetics Intersil Harris Raytheon AMD Intel TS - HM1-6617/ (or HM-6617 ) 31

32 SPECIAL VERSION 4096*4 = bit A Vcc A A7 A A8 A A9 A D0 A D1 A D2 A D3 /CE A11 GND /CE1 Fujitsu TS MB7134 OC MB

33 4096*4 = bit FSC Fujitsu NEC Fairchild A Vcc A A9 TS MB7152 upb A A10 upb431 A A11 A /CE1 OC A /CE2 A D0 A D1 A D2 GND D3 Motorola Signetics MMI TI Harris Raytheon AMD National TS 82S195 (45ns) 63S AM27S41 87S195 82S195A(35ns) 63S1641A - - AM27S41A 87S195A 82S195B(25ns) OC 63S1640 AM27S40 63LS1640 AM27S40A 33

34 4096*8 = bit A Vcc Waferscale A A8 Integration Inc A A9 Fujitsu WSI ICT A A A /CE1 TS MB7141 WS57C43C 27CX321 A A11 27CX322 A CE2 MB7142 (PROM-speed compatible EPROM A D7 version but pin s NOT 2732 compatible ) D D6 10 times EPROM speed! D D5 D D4 GND D3 Signetics MMI TI Harris Raytheon AMD National Intel TS 82S321 (70ns) HS321(45ns) 63S A AM27S43 87S321-82HS321A(35ns) 63S3281A AM27S43A 87S421-82HS321B(30ns)

35 8192*8 = bit Fujitsu Lattice Cypress Fairchild National A Vcc A A8 TS MB7143 PR64K8 CY7C261 93Z565 93Z665C A A9 MB7144 CY7C263 93Z565A 93Z667C A A10 CY7C264 - A /CE1 (EPROM s) A A11 A A12 Waferscale A D7 Integration Inc D D6 WSI ICT Sharp NEC D D D D4 TS WS57C49C 27CX641 SH HC65 GND D3 (EPROM) 27CX642 Signetics MMI TI Harris Raytheon AMD SSI TS 82S641 (55ns) - TMS27PC AM27S49 SS S641A(45ns) A-5 - AM27S49A 82S641B(35ns) (Some devices are PROM-pin AND -speed compatible EPROM s 10x faster EPROM) 35

36 VERY SPECIAL VERSION with POWER DOWN mode on CE pin 8192*8 = bit Vcc 1 28 Vcc A Vcc A NC A A8 A A9 A A11 A /OE Cypress A A A /CE CY7C266 A D7 D D6 D D5 D D4 GND D3 NO Bipolar device, but fast EPROM technology 36

37 VERY SPECIAL LATCHED VERSION 8192*8 = bit A Vcc A A8 A A9 A A10 A A11 A A12 GND 7 22 /OE/E/INIT Cypress Clk 8 21 GND A GND CY7C265 A D7 D D6 D D5 D D4 GND D3 NO Bipolar device, but fast EPROM technology 37

38 16384*8 = bit A Vcc A A10 A A11 A A12 A A13 Waferscale A /CE1 Integration Inc A /CE2 WSI A CS A /CS4 TS WS57C51C A D7 (=EPROM version) D D6 D D5 D D4 GND D3 Philips/NXP Signetics AMD Cypress Sharp TS 82HS S51 CY7C251 LH57127 CY7C253 CY7C254 ( EPROM ) (Some devices are PROM-pin AND -speed compatible EPROM s 10x faster EPROM) 38

39 32768*8 = bit A Vcc A A10 A A11 A A12 A A13 Waferscale A A14 Integration Inc A /CE3 WSI A CS A /CS1 TS WS57C71C A D7 D D6 D D5 (= fast EPROM version) D D4 GND D3 (This device is a PROM in EPROM technology 10x faster EPROM) 39

40 VERY SPECIAL LATCHED VERSION 32768*8 = bit A Vcc A A10 A A11 A A12 A A13 A A14 A ALE Cypress A Clk A /OE CY7C277 A D7 D D6 D D5 D D4 GND D3 ( fast EPROM version) (This device is a PROM in EPROM technology 10x faster EPROM) 40

41 VERY SPECIAL VERSION with POWER DOWN mode on CE pin 32768*8 = bit A Vcc A A10 A A11 A A12 A A13 A A14 A /CS1 Cypress A CS A /CE CY7C mil A D7 D D6 D D5 D D4 GND D3 ( fast EPROM version) (This device is a PROM in EPROM technology 10x faster EPROM) 41

42 VERY SPECIAL VERSION with POWER DOWN mode on CE pin 32768*8 = bit Vpp 1 28 Vcc A A14 A A13 A A8 A A9 A A11 A /OE Cypress A A A /CE CY7C mil A D7 D D6 D D5 D D4 GND D3 ( fast EPROM version) (This device is a PROM in EPROM technology 10x faster EPROM) 42

43 FOLLOWING NOW: TTL (ONLY) bipolar RAM 43

44 THIS IS NOT A PROM 8*4 = 32 bit This is a RAM, it s here to be complete and not confused /WE 1 24 Vcc Dual output port memory (single port IN ) DI WE DI DI2 A DI3 A0 A3 = read / write addresses port A A B0 B0 B3 = read only addresses port B A B1 /SA 7 18 B2 DIx = data IN D0A 8 17 /SB DxA = data port A out D1A 9 16 D3B DxB = data port B out D2A D2B /SA = enable output A D3A D1B /SB = enable output B GND D0B Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S OC 82S

45 THIS IS NOT A PROM 16*4 = 64 bit This is a RAM, it s here to be complete and not confused Standard INVERSE data OUT, except *1) A Vcc /CE 2 15 A1 /WE 3 14 A2 NEC Motorola I A /D I3 TS upb I /D3 /D I2 OC upb GND 8 9 /D2 Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 74S S AM27S F AM27S07 *1) 74F219 *1) OC 82S S AM27S A LS289 AM27LS02 *1) AM27S07 and 74F219 = NON-inverting outputs D0 D3 and NOT /D0 /D3 45

46 THIS IS NOT A PROM 32*2 = 64 bit This is a RAM, it s here to be complete and not confused /WE 1 16 Vcc /WS WS1 2 BIT Dual port Stack memory /Di Di1 A A0 CE 5 12 A1 STROBE 6 11 A2 Do A3 GND 8 9 Do1 TS Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel OC 82S21 46

47 THIS IS NOT A PROM 256*1 = 256 bit This is a RAM, it s here to be complete and not confused A Vcc A A2 /CE A3 NEC Motorola Hitachi /CE Din /CE /WE TS upb /Dout 6 11 A7 A A6 OC upb HM2504 GND 8 9 A5 Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S S AM27S00 - P S116 74S201 TTL AM27LS00 (82S06 TTL) 82LS16 OC 82S17-74S301 TTL AM27S01 - P S117 - (74S206 TTL) AM27LS01 (82S07 TTL) 82LS17 74LS301 47

48 THIS IS NOT A PROM 64*9 = 576 bit This is a RAM, it s here to be complete and not confused A Vcc Stack or FIFO memory (with parity or flag) A A2 A A1 OUTPUT IS THE COMPLEMENT OF THE INPUT DATA!! DI A0 ( = inverted! ) DI /DO0 DI /DO1 DI /DO2 DI /DO3 DI /DO4 DI /DO5 DI /DO6 DI /DO7 /WE /DO8 GND /CE Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS OC 82S S19 48

49 THIS IS NOT A PROM 1024*1 = 1024 bit This is a RAM, it s here to be complete and not confused /CE 1 16 Vcc A Din A /WE NEC Intersil Hitachi A A A A8 TS HM2511 A A7 Dout 7 10 A6 OC HM2510 GND 8 9 A5 Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S11-74S A OC 82S10-74S A ?? 49

50 THIS IS NOT A PROM 256*4 = 1024 bit This is a RAM, it s here to be complete and not confused A Vcc Stack memory A A4 A /WE A /CS1 A /OE A CS2 A D3out GND 8 15 D3in D0in 9 14 D2out D0out D2in D1in D1out Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS L

51 THIS IS NOT A PROM 256*8 = 2048 bit This is a RAM, it s here to be complete and not confused D Vcc Stack memory for 8X300 or 8X305 CPU D A7 Latched D A6 D A5 D A4 D A3 D A2 D A1 /ME 9 14 A0 WC MCLK GND SC Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 8X OC X 51

52 THIS IS NOT A PROM 256*8 = 2048 bit This is a RAM, it s here to be complete and not confused D Vcc D A7 Latched Stack or FIFO memory D A6 D A5 D A4 D A3 Latched and UN-latched mode D A2 D A1 OD 9 14 A0 /WE /L1 GND /CE Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S OC X 52

53 THIS IS NOT A PROM 256*9 = 2304 bit This is a RAM, it s here to be complete and not confused D Vcc Latched Stack or FIFO memory (with parity or flag) D A7 D A6 Latched and UN-latched mode D A5 D A4 D A3 D A2 D A1 D A0 OD /L2 /WE /L1 GND /CE Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S OC X

54 THIS IS NOT A PROM 256*9 = 2304 bit This is a RAM, it s here to be complete and not confused D Vcc Stack or FIFO memory (with parity or flag) D A7 D A6 D A5 D A4 D A3 D A2 D A1 D A0 /OE /CE GND /WE Motorola Philips/NXP Fairchild Signetics MMI TI Harris Raytheon AMD National Intel TS 82S OC X