88CO196EC Datasheet, PDF (31/44 Pages) Intel Corporation – CHMOS 16-Bit Microcontroller

Intel^® 88CO196EC
Table 8.
AC Characteristics, Demultiplexed Bus Mode (Sheet 2 of 2)
Symbol
Parameter
Min
Max
Units
T_WLWH WR# Low to WR# High
3t – 18
ns (3)
T_WHQX Output Data Hold after WR# High
t–2
t + 20
ns
T_WHLH WR# High to ALE High
t–5
t + 10
ns (3)
T_WHBX BHE#, INST Hold after WR# High
t–5
ns
T_WHAX A20:0, CSx# Hold after WR# High
0
ns
T_RHBX BHE#, INST Hold after RD# High
t–5
ns
T_RHAX A20:0, CSx# Hold after RD# High
0
ns
T_AVYV
A20:0 Valid to READY Setup
3t – 45 ns (6)
T_CLYX
READY Hold after CLKOUT Low
0
2t – 36 ns (7,8,9)
T_YLYH
READY Low to READY High
No Upper Limit
ns
1. Device is static by design but has been tested only down to 16MHz.
2. 20MHz is the maximum input frequency when using an external crystal oscillator; however, 40MHz can be
applied with an external clock source.
3. If wait states are used, add 2t × n, where n = number of wait states.
4. Assumes CLKOUT is operating in divide-by-two mode (f/2).
5. Assuming back-to-back bus cycles.
6. When forcing wait states using the BUSCON register, add 2t × n.
7. Exceeding the maximum specification causes additional wait states.
8. The first falling edge of READY is not synchronized to a CLKOUT edge; therefore, one programmed wait
state is required.
9. 8-bit bus only.
Datasheet
31