xr
ST16C2450
REV. 4.0.1
2.97V TO 5.5V DUART
21
AC ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: 0O TO 70OC (-40O TO +85OC FOR INDUSTRIAL GRADE PACKAGE), VCC IS 2.97V TO
5.5V, 70 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
3.3
MIN
MAX
LIMITS
5.0
MIN
MAX
UNIT
-
Crystal Frequency
16
24
MHz
CLK
External Clock Low/High Time
25
21
ns
OSC
External Clock Frequency
20
24
MHz
TAS
Address Setup Time
5
0
ns
TAH
Address Hold Time
10
5
ns
TCS
Chip Select Width
66
50
ns
TRD
IOR# Strobe Width
35
25
ns
TDY
Read Cycle Delay
40
30
ns
TRDV
Data Access Time
35
25
ns
TDD
Data Disable Time
0
25
0
15
ns
TWR
IOW# Strobe Width
40
25
ns
TDY
Write Cycle Delay
40
30
ns
TDS
Data Setup Time
20
15
ns
TDH
Data Hold Time
5
ns
TWDO
Delay From IOW# To Output
50
40
ns
TMOD
Delay To Set Interrupt From MODEM Input
40
35
ns
TRSI
Delay To Reset Interrupt From IOR#
40
35
ns
TSSI
Delay From Stop To Set Interrupt
1
Bclk
TINT
Delay From Initial INT Reset To Transmit Start
8
24
8
24
Bclk
TWRI
Delay From IOW# To Reset Interrupt
45
40
ns
TRST
Reset Pulse Width
40
ns
N
Baud Rate Divisor
1
216-1
1
216-1
-
Bclk
Baud Clock
16X of data rate
Hz