ISDN Data and Telephony Protocol Engine (inc. X.25)
CMX228
AC Timing Parameters (continued)
For the following conditions unless otherwise specified:
Xtal Frequency = 32MHz, AVDD = DVDD0 = DVDD1 = 3.0V to 5.0V, Tamb = - 40°C to +85°C.
Read/Write operation (1/2)
Parameter
Address setup time
Symbol
Conditions
Min.
Max.
Units
VDD = +5.0V ± 10%
(0.5 + a) T - 15
ns
-
tSAST
(0.5 + a) T - 31
(0.5 + a) T - 17
(0.5 + a) T - 40
0.5T - 24
ns
ns
-
-
ASTB high-level width
VDD = +5.0 V ± 10%
VDD - +5.0 V ± 10%
tWSTH
tHSTLA
ns
ns
-
-
Address hold time to (ASTB¯)
0.5T - 34
0.5T - 14
(1 + a) T - 9
ns
ns
-
-
Address hold time (to RD• )
Delay from address to RD¯
tHRA
tDAR
VDD = +5.0V ±10%
ns
-
(1 + a) T - 15
ns
ns
-
0
Address float time (to RD¯)
-
-
tFRA
Delay from address to data input
VDD = +5.0V ±10%
VDD = +5.0V ± 10%
VDD = +5.0 V ± 10%
(2.5 + a + n) T - 37
ns
tDAID
(2.5 + a + n) T - 52
(2 + n) T - 40
ns
ns
-
-
Delay from ASTB¯ to data input
Delay from RD¯ to data input
tDSTID
tDRID
(2 + n) T - 60
(1.5 + n) T - 50
ns
ns
-
-
(1.5 + n) T - 70
ns
ns
-
0.5T - 9
Delay from ASTB¯ to RD¯
Data hold time (to RD• )
Delay from RD• to address active
-
-
tDSTR
tHRID
tDRA
0
ns
VDD = +5.0 V ± 10%
After program is read
0.5T - 8
0.5T - 12
1.5T - 8
-
-
-
ns
ns
ns
After program is read
VDD = +5.0 V ± 10%
After data is read
After data is read
VDD = 5.0 V ± 10%
1.5T - 12
0.5T - 17
(1.5 + n) T - 30
-
-
-
ns
ns
Delay from RD• to ASTB•
RD low-level width
tDRST
tWRL
ns
(1.5 + n) T - 40
0.5T - 14
(1 + a) T - 5
(1 + a) T - 15
-
ns
ns
-
-
Address hold time (to WR• )
Delay from address to WR¯
tHWA
tDAW
VDD = +5.0V ± 10%
VDD = +5.0V ± 10%
ns
-
ns
ns
-
0.5T + 19
Delay from ASTB¯ to data output
tDSTOD
0.5T + 35
0.5T - 11
ns
ns
-
-
Delay from WR¯ to data output
Delay from ASTB¯ to WR¯
tDWOD
tDSTW
0.5T - 9
ns
-
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
36
D/228/1
CMLMICRO [ CML MICROCIRCUITS ]
