Specifications

Technical Spec of a Flash and RAM chips

  Z80 4MHz

A29040B Flash

BS62LV8001

AS6C8008

LY62W10248-55

CY62158ELL-45ZSXI 

Supply Voltage Min

V  2.42.7

2.7

4.5
Supply Voltage Typ  -3.03.05.0
Supply Voltage MaxV  5.55.55.55.5

Input High Voltage

2.2 to VCC

0.7 x VCC min

to VCC+0.3

2.2 to VCC+0.3

2.4 to VCC+0.3

2.4 to VCC+0.5

2.2 to VCC + 0.5 V

Input Low Voltage

V-0.3 to 0.8

0.5 to 0.8

-0.5 to 0.8

- 0.2 to 0.6

- 0.2 to 0.6

 –0.5 to 0.8

Output High Voltage

V2.4 min0.85 x VCC

2.4 min

2.4 min  2.4 min

Output Low Voltage

V0.4 max0.45

0.4 max

0.4 max

 

0.4  max

Standby Power 

uA 1

3.5 to 50

6 to 8010 to 50 2 to 8
Power ConsumptionmA  20 - 40396030 to 60 1.8 to 3

VCC for Data Retention

V  1.52.01.5 2.0
Read Timings       
Read Cycle Time tRC  ns 55 min55 min55 min55 min 45 min
Address Access Time tAA   55 min 55 max55 max55 max 45 max

Chip Enable Access Time tACE 

  55 min55 max55 max55 max45 max
Output Enable Access Time tOE   30 max25 max30 max 30 max22 max
Chip Enable to Output in Low-Z tCLZ   18 min10 min10 min10 min5 min
Output Enable to Output in Low-Z tOLZ   18 min10 min5 min 5 min10 min
Chip Disable to Output in High-Z tCHZ    30 max20 max20 max18 max 

Output Disable to Output in High-Z tOHZ

   25 max20 max20 max

18 max 

Output Hold from Address Change tOH

  10 min10 min10 min10 min
Write Timings       

Write Cycle Time tWC

  55 min 55 min55 min 55 min45 min

Address Valid to End of Write tAW

  40 min 40 min50 min50 min 

35 min 

Chip Enable to End of Write tCW 

   050 min 50 min

35 min

Address Set-up Time tAS 

  040 min035 min

Write Pulse Width tWP 

  20 min30 min45 min45 min35 min 

Write Recovery Time tWR 

  00 

Data to Write Time Overlap tDW 

   25 min25 min25 min 25 min25 min

Data Hold from End of Write Time tDH 

  0000

Data Setup to Write End

      

25 min

Output Active from End of Write tOW 

   5 min5 min 5 min 

Write to Output in High-Z tWHZ 

   25 max20 max20 max 10 max
  THE Z80 CPU :
TIMING
     

512K RAM

The memory chip described in the article below is no longer available. A suitable replacement may be

ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32

Note: This has not been tested. Rakewell will be selling their Flash/RAM PCB. This may be used instead of modifying the original 32K PCB board. This would upgrade the card to 1M.

Amplia un cartucho de Z88 hasta 512Kbytes - Convert 32K RAM card to 512K RAM

Internal RAM

The memory chip described in the article below is no longer available. A suitable replacement may be

ALLIANCE MEMORY - AS6C4008-55PCN - SRAM, 4MB, 2.7V-5.5V, 512KX8, PDIP32

This has not been tested yet

Z88 32kb to 512kb Memory Upgrade

The memory chip described in this article below is no longer available. A suitable replacement may be

ALLIANCE MEMORY - AS6C4008-55SIN - SRAM, 4MB, 2.7V-5.5V, 512KX8, SOP32

This has not been tested yet

Wide internally your Z88 to 512Kbytes

The memory chip described in the article below is no longer available. A suitable replacement may be

ALLIANCE MEMORY - AS6C1008-55PCN - SRAM, 1MB, 2.7V-5.5V, 128KX8, PDIP32

This has not been tested yet

Z88 32kb to 128K Upgrade

Internal ROM

 

The EPROM chip described in the article below is no longer available. A suitable FLASH chip replacement is

AMIC - A29040B-70F - IC, FLASH 5V 4MB, 29F040, DIP32

Z88 Motherboard Modifications


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