XR16M781 Datasheet, PDF (44/52 Pages) Exar Corporation – 1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE

XR16M781
1.62V TO 3.63V UART WITH 64-BYTE FIFO AND VLIO INTERFACE
REV. 1.0.1
For Power-Save, the UART internally isolates all of these inputs (except the modem inputs and Reset pins) therefore elimi-
nating any unnecessary external buffers to keep the inputs steady. SEE”POWER-SAVE FEATURE” ON PAGE 21. To
achieve minimum power drain, the voltage at any of the inputs of the M781 should NOT be lower than its VCC supply.
AC ELECTRICAL CHARACTERISTICS
TA = -40^O TO +85^OC, VCC IS 1.62 TO 3.6V, 25 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
1.8V ± 10%
MIN
MAX
LIMITS
2.5V ± 10%
MIN
MAX
XTAL1 UART Crystal Frequency
24
24
ECLK External Clock Frequency
40
64
T_ECLK External Clock Time Period
12
7
T_AS
Address Setup Time
10
8
T_AH
Address Hold Time
3
2
T_CSL Delay from CS# to LLA#/IOR#/IOW#
0
0
T_LLA LLA# Strobe Width
10
10
T_RD
IOR# Strobe Width
40
25
T_LLAR Delay from LLA# to IOR#
2
2
T_LLAW Delay from LLA# to IOW#
2
2
T_DY
Read/Write Cycle Delay
40
25
T_RDV Data Access Time
40
20
T_DD
Data Disable Time
20
10
T_WR IOW# Strobe Width
10
10
T_DS
Data Setup Time
10
8
T_DH
Data Hold Time
3
2
T_WDO Delay From IOW# To Output
50
50
T_MOD Delay To Set Interrupt From MODEM
50
50
Input
T_RSI Delay To Reset Interrupt From IOR#
50
50
T_SSI Delay From Stop To Set Interrupt
1
1
T_RRI Delay From IOR# To Reset Interrupt
45
45
T_SI
Delay From Start To Interrupt
45
45
T_INT Delay From Initial INT Reset To
Transmit Start
8
24
8
24
T_WRI Delay From IOW# To Reset Interrupt
45
45
T_SSR Delay From Stop To Set RXRDY#
1
1
LIMITS
3.3V ± 10%
MIN
MAX
24
80
6
6
2
0
10
20
2
2
20
15
10
10
6
2
50
50
UNIT
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
50
ns
1
Bclk
45
ns
45
ns
8
24 Bclk
45
ns
1
Bclk
44