XR16C2550 Datasheet, PDF (26/38 Pages) Exar Corporation – 2.97V TO 5.5V DUART WITH 16-BYTE FIFO

XR16C2550
2.97V TO 5.5V DUART WITH 16-BYTE FIFO
xr
REV. 1.0.1
AC ELECTRICAL CHARACTERISTICS
TA=-40^O TO +85^OC, VCC = 2.97V TO 5.5V, 70 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
-
CLK
OSC
T_AS
T_AH
T_CS
T_RD
T_DY
Crystal Frequency
Clock Pulse Duration
External Clock Frequency
Address Setup Time
Address Hold Time
Chip Select Width
IOR# Strobe Width
Read or Write Cycle Delay
3.3
LIMITS
MIN
MAX
20
17
30
5
10
70*
70*
70*
5.0
LIMITS
MIN
MAX
24
8
64
0
5
40
40
40
T_RDV Data Access Time
35
25
T_DD Data Disable Time
0
25
0
15
T_WR IOW# Strobe Width
40
25
T_DS Data Setup Time
20
15
T_DH Data Hold Time
5
5
T_WDO Delay From IOW# To Output
50
40
T_MOD Delay To Set Interrupt From MODEM
Input
40
35
T_RSI Delay To Reset Interrupt From IOR#
40
35
T_SSI Delay From Stop To Set Interrupt
1
1
T_RRI Delay From IOR# To Reset Interrupt
45
40
T_SI Delay From Start To Interrupt
45
40
T_INT Delay From Initial INT Reset To Transmit
8
24
8
24
Start
T_WRI Delay From IOW# To Reset Interrupt
45
40
T_SSR Delay From Stop To Set RXRDY#
1
1
T_RR Delay From IOR# To Reset RXRDY#
45
40
T_WT Delay From IOW# To Set TXRDY#
45
40
T_SRT
Delay From Center of Start To Reset
TXRDY#
8
8
T_RST Reset Pulse Width
40
40
N
Baud Rate Divisor
1
2¹⁶-1
1
2¹⁶-1
Bclk Baud Clock
16X of data rate
UNIT
ns
ns
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Bclk
ns
ns
Bclk
ns
Bclk
ns
ns
Bclk
ns
-
Hz
COMMENTS
* 55ns if VCC =
3.3V +10%/-5%
and
TA = 0 to 70^oC
(See Figure 12)
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