23
COMMERCIAL TEMPERATURE RANGE
IDT7290820 5V TIME SLOT INTERCHANGE
DIGITAL SWITCH 2,048 x 2,048
t
ALW
ADDRESS
DATA
t
ADS
t
ADH
ALE
5713 drw15
t
RW
t
WW
t
CSRW
t
ALRD
t
CSR
t
CSW
t
DHW
t
DHR
t
AKH
t
DDR
t
DSW
t
SWD
t
ALWR
t
AKD
AD0-AD7
D8-D15
CS
RD
WR
DTA
Figure 12. Multiplexed Bus Timing (Intel Mode)
AC ELECTRICAL CHARACTERISTICS - MULTIPLEXED BUS TIMING (INTEL)
NOTE:
1. High Impedance is measured by pulling to the appropriate rail with R
L
, with timing corrected to cancel time taken to discharge C
L
.
Symbol Parameter Min. Typ. Max. Units Test Conditions
t
ALW ALE Pulse Width 20 ns
t
ADS Address Setup from ALE falling 10 ns
t
ADH Address Hold from ALE falling 10 ns
t
ALRD RD Active after ALE falling 10 ns
t
DDR Data Setup from DTA LOW on Read 10 ns CL = 150pF
t
CSRW CS Hold after RD/WR 0 ns
t
RW RD Pulse Width (Fast Read) 80 ns
t
CSR CS Setup from RD 0 ns
t
DHR
(1)
Data Hold after RD 10 75 ns CL = 150pF, RL = 1K
t
WW WR Pulse Width (Fast Write) 45 ns
t
ALWR WR Delay after ALE falling 3 ns
t
CSW CS Setup from WR 0 ns
t
DSW Data Setup from WR (Fast Write) 20 ns
t
SWD Valid Data Delay on Write (Slow Write) 122 ns
t
DHW Data Hold after WR Inactive 5 ns
t
AKD Acknowledgment Delay:
Reading/Writing Registers 50/60 ns C
L = 150pF
Reading/Writing Memory @ 2.048 Mb/s 760/780 ns C
L = 150pF
@ 4.096 Mb/s 400/420 ns C
L = 150pF
@ 8.192 Mb/s 220/240 ns C
L = 150pF
t
AKH
(1)
Acknowledgment Hold Time 45 80 ns CL = 150pF, RL = 1K
