Siemens EF 88H Series Manual de usuario descargar pdf (Pagina 127)

Device Specification

Semiconductor Group 7-65

AC Characteristics

= 5 V + 10 %, – 15 %; V

= 0 V

= 0 to 70

C for the SAB 80C517A/83C517A-5

= – 40 to 85

C for the SAB 80C517A-T3/83C517A-5-T3

= – 40 to110

C for the SAB 80C517A-T4/83C517A-5-T4

for port 0, ALE and

PSEN outputs = 100 pF; C

for all other outputs = 80 pF)

Parameter Symbol Limit values Unit

18 MHz clock Variable clock

1/t

CLCL

= 3.5 MHz to 18 MHz

min. max. min. max.

Program Memory Characteristics

ALE pulse width t

LHLL

71 –2 t

CLCL

– 40 – ns

Address setup to ALE t

AVLL

26 – t

CLCL

– 30 – ns

Address hold after ALE t

LLAX

26 – t

CLCL

– 30 – ns

ALE to valid instruction t

LLIV

– 122 – 4t

CLCL

– 100 ns

ALE to PSEN t

LLPL

31 – t

CLCL

– 25 – ns

PSEN pulse width t

PLPH

132 – 3 t

CLCL

– 35 – ns

PSEN to valid instruction t

PLIV

–92– 3t

CLCL

– 75 ns

Input instruction hold

after PSEN

PXIX

0–0 ns

Input instruction float

after PSEN

PXIZ

–46– t

CLCL

– 10 ns

Address valid after

PSEN

PXAV*)

48 – t

CLCL

– 8 – ns

Address to valid instr in t

AVIV

– 218 – 5t

CLCL

– 60 ns

Address float to PSEN t

AZPL

0–0 – ns

Interfacing the SAB 80C51 7A to devices with float times up to 45 ns is permissible.

This limited bus contention will not cause any damage to port 0 drivers.

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