XR16L2450
xr
2.25V TO 5.5V DUART
REV. 1.1.1
22
AC ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: TA=-40O TO +85OC, VCC IS 2.25V TO 5.5V,
70 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
2.5
MIN
MAX
LIMITS
3.3
MIN
MAX
LIMITS
5.0
MIN
MAX
UNIT
-
Crystal Frequency
8
16
24
MHz
CLK
External Clock Low/High Time
31
25
21
ns
OSC
External Clock Frequency
16
20
24
MHz
TAS
Address Setup Time
10
ns
TAH
Address Hold Time
10
ns
TCS
Chip Select Width
150
75
50
ns
TRD
IOR# Strobe Width
150
75
50
ns
TDY
Read Cycle Delay
150
75
50
ns
TRDV
Data Access Time
125
70
45
ns
TDD
Data Disable Time
0
45
0
30
0
30
ns
TWR
IOW# Strobe Width
150
75
50
ns
TDY
Write Cycle Delay
150
75
50
ns
TDS
Data Setup Time
25
20
15
ns
TDH
Data Hold Time
15
10
ns
TWDO
Delay From IOW# To Output
150
75
50
ns
TMOD
Delay To Set Interrupt From MODEM Input
150
75
50
ns
TRSI
Delay To Reset Interrupt From IOR#
150
75
50
ns
TSSI
Delay From Stop To Set Interrupt
1
Bclk
TINT
Delay From Initial INT Reset To Transmit
Start
8
24
8
24
8
24
Bclk
TWRI
Delay From IOW# To Reset Interrupt
150
75
50
ns
TRST
Reset Pulse Width
40
ns
N
Baud Rate Divisor
1
216-1
1
216-1
1
216-1
-
Bclk
Baud Clock
16X of data rate
Hz