22
ST16C452/452PS
Rev. 3.20
Symbol Parameter Limits Limits Units Conditions
3.3 5.0
Min Max Min Max
T
1w
,T
2w
Clock pulse duration 17 17 ns
T
3w
Oscillator/Clock frequency 8 24 MHz
T
6s
Address setup time 5 0 ns
T
7d
-IOR delay from chip select 10 10 ns
T
7w
-IOR strobe width 35 25 ns
T
7h
Chip select hold time from -IOR 0 0 ns
T
9d
Read cycle delay 40 30 ns
T
12d
Delay from -IOR to data 35 25 ns
T
12h
Data disable time 25 15 ns
T
13d
-IOW delay from chip select 10 10 ns
T
13w
-IOW strobe width 40 25 ns
T
13h
Chip select hold time from -IOW 0 0 ns
T
15d
Write cycle delay 40 30 ns
T
16s
Data setup time 20 15 ns
T
16h
Data hold time 5 5 ns
T
17d
Delay from -IOW to output 50 40 ns 100 pF load
T
18d
Delay to set interrupt from MODEM 40 35 ns 100 pF load
input
T
19d
Delay to reset interrupt from -IOR 40 35 ns 100 pF load
T
20d
Delay from stop to set interrupt 1 1 Rclk
T
21d
Delay from -IOR to reset interrupt 45 40 ns 100 pF load
T
22d
Delay from stop to interrupt 45 40 ns
T
23d
Delay from initial INT reset to transmit 8 24 8 24 Rclk
start
T
24d
Delay from -IOW to reset interrupt 45 40 ns
T
39w
-ACK pulse width 75 75 ns
T
40s
PD7 - PD0 setup time 15 10 ns
T
41h
PD7 - PD0 hold time 30 25 ns
T
42d
Delay from -ACK low to interrupt low 10 5 ns
T
43d
Delay from -IOR to reset interrupt 10 5 ns
T
R
Reset pulse width 40 40 ns
N Baud rate devisor 1 2
16
-1 1 2
16
-1 Rclk
AC ELECTRICAL CHARACTERISTICS
T
A
=0° - 70°C (-40° - +85°C for Industrial grade packages), Vcc=3.3 - 5.0 V ± 10% unless otherwise specified.
