XR16L2552
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
xr
REV. 1.1.1
AC ELECTRICAL CHARACTERISTICS
o
o
Unless Otherwise Noted: TA=-40 to +85 C, Vcc is 2.25V to 5.5V,
70 pF load where applicable
LIMITS
LIMITS
3.3
LIMITS
SYMBOL
PARAMETER
2.5
5.0
UNIT
MIN
MAX
MIN
MAX MIN
MAX
TRST
N
Reset Pulse Width
40
40
40
ns
-
216-1
216-1
216-1
Baud Rate Divisor
Baud Clock
1
1
1
Bclk
16X of data rate
Hz
FIGURE 14. CLOCK TIMING
CLK
CLK
EXTERNAL
CLOCK
OSC
FIGURE 15. MODEM INPUT/OUTPUT TIMING FOR CHANNELS A & B
IOW #
Active
TW DO
RTS#
DTR#
Change of state
Change of state
CD#
CTS#
DSR#
Change of state
Change of state
TMOD
TMOD
Active
INT
Active
Active
Active
TRSI
IOR#
Active
Active
TMOD
Change of state
RI#
38
EXAR [ EXAR CORPORATION ]
