XR19L400 Datasheet, PDF (38/45 Pages) Exar Corporation – SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER

XR19L400
PRELIMINARY
SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
AC ELECTRICAL CHARACTERISTICS
REV. P1.0.0
UNLESS OTHERWISE NOTED: TA=-40^O TO +85^OC, VCC=3.0 - 5.5V, 50 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
3.3
MIN
MAX
LIMITS
5.0
MIN
MAX
UNIT
T_SI
T_INT
T_WRI
T_RST
N
Delay From Stop To Interrupt
Delay From Initial INT Reset To Transmit Start
Delay From IOW# To Reset Interrupt
Reset Pulse Width
Baud Rate Divisor
50
50 ns
8
24
8
24 Bclk
50
50 ns
40
40
ns
1
2¹⁶-1
1
2¹⁶-1 ^-
Bclk Baud Clock
16X or 8X of data rate
Hz
FIGURE 12. CLOCK TIMING
EXTERNAL
CLOCK
CLK
CLK
OSC
38