XR16L2751_05 Datasheet, PDF (42/52 Pages) Exar Corporation – 2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE

XR16L2751
2.25V TO 5.5V DUART WITH 64-BYTE FIFO AND POWERSAVE
xr
REV. 1.2.2
AC ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: TA=0^O TO 70^OC (-40^O TO +85^OC FOR INDUSTRIAL GRADE PACKAGE), VCC=2.25 - 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
T_WDO
T_MOD
Delay From IOW# To Output
Delay To Set Interrupt From MODEM Input
150
75
150
75
50 ns
50 ns
T_RSI Delay To Reset Interrupt From IOR#
150
75
50 ns
T_SSI
T_RRI
T_SI
T_INT
T_WRI
T_SSR
T_RR
T_WT
T_SRT
T_RST
N
Delay From Stop To Set Interrupt
Delay From IOR# To Reset Interrupt
Delay From Stop To Interrupt
Delay From Initial INT Reset To Transmit Start
Delay From IOW# To Reset Interrupt
Delay From Stop To Set RXRDY#
Delay From IOR# To Reset RXRDY#
Delay From IOW# To Set TXRDY#
Delay From Center of Start To Reset TXRDY#
Reset Pulse Width
Baud Rate Divisor
1
1
1 Bclk
150
75
50 ns
150
75
50 ns
8
24
8
24
8
24 Bclk
150
75
50 ns
1
1
1 Bclk
150
75
50 ns
150
75
50 ns
8
8
8 Bclk
40
40
40
ns
1
2¹⁶-1
1
2¹⁶-1
1
2¹⁶-1 ^-
Bclk Baud Clock
16X or 8X of data rate
Hz
FIGURE 14. CLOCK TIMING
EXTERNAL
CLOCK
CLK
CLK
OSC
42