XR16L2550 Datasheet, PDF (37/45 Pages) Exar Corporation – LOW VOLTAGE DUART WITH 16-BYTE FIFO

áç
REV. 1.0.0
XR16L2550
LOW VOLTAGE DUART WITH 16-BYTE FIFO
AC ELECTRICAL CHARACTERISTICS
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
N Baud Rate Divisor
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_WDO
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
37