IDT72V8985 Integrated Device Technology, IDT72V8985 Datasheet - Page 13

• Manufacturer Part Number: IDT72V8985
• Description: 3.3 Volt Time Slot Interchange Digital Switch 256 X 256
• Manufacturer: Integrated Device Technology

AC ELECTRICAL CHARACTERISTICS  MICROPROCESSOR TIMING
NOTE:
1. Timing is over recommended temperature and power supply voltages.
2. Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing.
3. High Impedance is measured by pulling to the appropriate rail with R
IDT72V8985 3.3V Time Slot Interchange
Digital Switch 256 x 256
WRITE
D0-D7
D0-D7
READ
A0-A5
R/W
DTA
Symbol
CS
DS
t
t
t
t
t
t
t
t
t
t
t
t
t
RWS
RWH
DSW
SWD
DHW
CSS
ADS
CSH
ADH
DDR
DHR
AKD
AKH
Characteristics
CS Setup from DS Rising
R/W Setup from DS Rising
Add Setup from DS Rising
CS Hold after DS Falling
R/W Hold after DS Falling
Add Hold after DS Falling
Data Setup from DTA Low on Read
Data Hold on Read
Data Setup on Write (Fast Write)
Valid Data Delay on Write (Slow Write)
Data Hold on Write
Acknowledgment Delay:
Reading Data Memory
Reading/Writing Connection Memory
Writing to Control Register
Reading to Control Register
Acknowledgment Hold Time
Figure 12. Motorola Non-Multiplexed Bus Timing
t
t
t
RWS
ADS
CSS
Min.





10
10
10
10
0
5
5
0
5
5
5
L
t
, with timing corrected to cancel time taken to discharge C
SWD
13
300/370
Typ.
560










50
45
45
20
t
AKD
t
(2)
DDR
t
730/800
DSW
VALID DATA
Max.
1220
122









90
70
70
40
VALID DATA
t
DHW
Commercial Temperature Range
Unit
t
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
L
AKH
.
t
t
RWH
t
CSH
ADH
t
DHR
R
R
L
L
= 1KΩ
= 1KΩ
Test Conditions
C
C
L
L
= 150pF
= 150pF
(3)
(3)
, C
, C
L
L
5707 drw15
= 150pF
= 150pF