xr
XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
REV. 1.1.1
AC ELECTRICAL CHARACTERISTICS
o
o
Unless Otherwise Noted: TA=-40 to +85 C, Vcc is 2.25V to 5.5V,
70 pF load where applicable
LIMITS
LIMITS
3.3
LIMITS
5.0
SYMBOL
PARAMETER
2.5
UNIT
MIN
MAX
MIN
MAX MIN
MAX
-
Crystal Frequency
16
20
24
MHz
ns
CLK
OSC
TAS
External Clock Low/High Time
External Clock Frequency
Address Setup Time
31
17
10
16
30
50
MHz
ns
10
10
10
10
75
75
75
10
10
50
50
50
TAH
TCS
Address Hold Time
ns
ns
Chip Select Width
150
150
150
TRD
TDY
IOR# Strobe Width
ns
Read Cycle Delay
ns
TRDV
TDD
TWR
TDY
Data Access Time
125
45
70
30
45
30
ns
Data Disable Time
0
0
0
ns
IOW# Strobe Width
150
150
25
75
75
20
10
50
50
15
10
ns
Write Cycle Delay
ns
TDS
Data Setup Time
ns
TDH
TWDO
TMOD
TRSI
TSSI
TRRI
TSI
Data Hold Time
15
ns
Delay From IOW# To Output
Delay To Set Interrupt From MODEM Input
Delay To Reset Interrupt From IOR#
Delay From Stop To Set Interrupt
Delay From IOR# To Reset Interrupt
Delay From Stop To Interrupt
150
150
150
1
75
75
75
1
50
50
50
1
ns
ns
ns
Bclk
ns
150
150
24
75
75
24
50
50
24
ns
TINT
Delay From Initial INT Reset To Transmit
Start
8
8
8
Bclk
TWRI
TSSR
TRR
Delay From IOW# To Reset Interrupt
Delay From Stop To Set RXRDY#
150
1
75
1
50
1
ns
Bclk
ns
Delay From IOR# To Reset RXRDY#
Delay From IOW# To Set TXRDY#
Delay From Center of Start To Reset TXRDY#
150
150
8
75
75
8
50
50
8
TWT
ns
TSRT
Bclk
37
EXAR [ EXAR CORPORATION ]
