ISDN Data and Telephony Protocol Engine (inc. X.25)
CMX228
Read/Write operation (2/2)
Parameter
Symbol
Conditions
Min.
Max.
Units
VDD = +5.0 V ± 10%
(1.5 + n) T - 30
ns
Data setup time (to WR• )
-
tSODW
(1.5 + n) T - 40
0.5T - 5
0.5T - 25
0.5T - 12
(1.5 + n) T - 30
(1.5 + n) T - 40
ns
ns
-
-
Data hold time (to WR• )Note 1
tHWOD
VDD = +5.0V ± 10%
VDD = +5.0V ± 10%
ns
ns
-
-
Delay from WR• to ASTB•
WR low-level width
tDWST
tWWL
ns
ns
-
-
Note 1: Hold time includes the time during which VOH1 and VOL1 are held under the load conditions of CL = 50 pF and RL = 4.7 kW.
Bus Hold timing
Parameter
Symbol
Conditions
Min.
Max.
Units
(6 + a + n) T + 50
(7 + a + n) T + 30
ns
ns
Delay from WAITN• to float
Delay from WAITN• to STN•
-
-
tFHQC
VDD = +5.0 V ± 10%
tDHQHHAH
(7 + a + n) T + 40
1T + 30
ns
ns
-
-
Delay from float to STN•
tDCFHA
VDD = +5.0 V ± 10%
VDD = +5.0 V ± 10%
2T + 40
2T + 60
ns
Delay from WAITN• to STN¯
-
tDHQLHAL
ns
ns
-
1T - 20
1T - 30
Delay from STN¯ to active
-
-
tDHAC
ns
Miscellaneous timing
Parameter
Symbol
Conditions
Min.
Max.
Units
ASTB cycle time
ASTB low-level width
nT
ns
ns
-
-
tCYCL
tCLL
VDD = +5.0 V ± 10%
VDD = +5.0 V ± 10%
0.5 tCYCL- 10
0.5 tCYCL- 20
0.5 tCYCL- 10
0.5 tCYCL- 20
-
-
ASTB high-level width
ns
ns
-
tCLH
-
10
20
10
20
ASTB rise time
ASTB fall time
VDD = +5.0 V ± 10%
VDD = +5.0 V ± 10%
tCLR
tCLF
-
-
ns
ns
-
NMI low-level width
NMI high-level width
10
10
µs
µs
-
-
tWNIL
tWNIH
RSTN low-level width
RSTN high-level width
10
10
µs
µs
-
-
tWRSL
tWRSH
Where:
T = tCYK (system clock cycle time)
a = 1 (during address wait), otherwise, 0.
n = Number of wait states (n = 2).
ã 1999 Consumer Microcircuits Limited
ã 1999 Chiron Technology Limited
37
D/228/1
CMLMICRO [ CML MICROCIRCUITS ]
