XR16L2550IM-F Datasheet, PDF (36/44 Pages) Exar Corporation – LOW VOLTAGE DUART WITH 16-BYTE FIFO

XR16L2550
LOW VOLTAGE DUART WITH 16-BYTE FIFO
AC ELECTRICAL CHARACTERISTICS
REV. 1.1.3
UNLESS OTHERWISE NOTED: TA=-40^O TO +85^OC, VCC IS 2.25V TO 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_RST
N
Reset Pulse Width
Baud Rate Divisor
40
40
40
ns
1
2¹⁶-1
1
2¹⁶-1
1
2¹⁶-1
-
Bclk Baud Clock
16X of data rate
Hz
FIGURE 14. CLOCK TIMING
EXTERNAL
CLOCK
CLK
CLK
OSC
FIGURE 15. MODEM INPUT/OUTPUT TIMING FOR CHANNELS A & B
IOW #
RTS#
DTR#
Active
Change of state
T _{W DO}
Change of state
CD#
CTS#
DSR#
INT
IOR#
RI#
T_MOD
Change of state
Change of state
Active
Active
T_MOD
T_RSI
Active
Active
Active
Active
T_MOD
Change of state
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