XR19L220 Datasheet, PDF (34/43 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER

XR19L220
PRELIMINARY
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
AC ELECTRICAL CHARACTERISTICS
REV. P1.0.2
UNLESS OTHERWISE NOTED: TA=0^O TO 70^OC (-40^O TO +85^OC FOR INDUSTRIAL GRADE PACKAGE), VCC=3.0 - 5.5V,
50 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
3.3
MIN
MAX
LIMITS
5.0
MIN
MAX
UNIT
T_RRI Delay From IOR# To Reset Interrupt
75
50 ns
T_SI Delay From Stop To Interrupt
75
50 ns
T_INT Delay From Initial INT Reset To Transmit Start
8
24
8
24 Bclk
T_WRI
T_RST
N
Delay From IOW# To Reset Interrupt
Reset Pulse Width
Baud Rate Divisor
75
50 ns
40
40
ns
1
2¹⁶-1
1
2¹⁶-1 ^-
Bclk Baud Clock
16X of data rate
Hz
FIGURE 12. CLOCK TIMING
EXTERNAL
CLOCK
CLK
CLK
OSC
34