IDT72V8980 Integrated Device Technology, IDT72V8980 Datasheet - Page 10

• Manufacturer Part Number: IDT72V8980
• Description: 3.3 Volt Time Slot Interchange Digital Switch 256 X 256
• Manufacturer: Integrated Device Technology

AC ELECTRICAL CHARACTERISTICS
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
4. Processor accesses are dependent on the C4i clock, and so some things are expressed as multiples of the C4i.
IDT72V8980 3.3V Time Slot Interchange
Digital Switch 256 x 256
D7-D0
A5-A0
DTA
Symbol
R/W
CS
DS
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
RWS
FWS
SWD
RWH
CSS
ADS
AKD
AKD
RDS
DHT
DHT
RDZ
CSH
ADH
AKH
Characteristics
Chip Select Setup Time
Read/Write Setup Time
Address Setup Time
Acknowledgment Delay Fast
Acknowledgment Delay Slow
Fast Write Data Setup Time
Slow Write Data Delay
Read Data Setup Time
Data Hold Time Read
Data Hold Time Write
Read Data to High Impedance
Chip Select Hold Time
Read/Write Hold Time
Address Hold Time
Acknowledgment Hold Time
t
t
t
RWS
ADS
CSS
Min.
t
SWD





10
20
10
10
Figure 11. Processor Bus
0
5
5
0
0
0
L
, with timing corrected to cancel time taken to discharge C
t
AKD
(1)
10
t
RDS
 PROCESSOR BUS
Typ.





2.0


40
50
50
20
5
5
5
(2)
t
FWS
Max.



4.5

1.7
0.5





60
75
40
cycles
cycles
cycles
Unit
Commercial Temperature Range
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
L
.
t
t
RWH
t
t
t
CSH
ADH
AKH
DHT
t
RDZ
R
R
R
C4i cycles, C
L
L
L
= 1KΩ
= 1KΩ
= 1KΩ
Test Conditions
C4i cycles
C
C4i cycles
L
= 150pF
(3)
(3)
(3)
, C
, C
, C
L
L
L
L
= 150pF
= 150pF
= 150pF
= 150pF
(4)
5705 drw1 5