XR16L2551_07 Datasheet, PDF (38/49 Pages) Exar Corporation – LOW VOLTAGE DUART WITH POWERSAVE

XR16L2551
LOW VOLTAGE DUART WITH POWERSAVE
AC ELECTRICAL CHARACTERISTICS
Unless otherwise noted: TA=-40^o to +85^oC, Vcc is 2.25V to 5.5V,
70 pF load where applicable
REV. 1.1.3
SYMBOL
PARAMETER
LIMITS
2.5
MIN
MAX
LIMITS
3.3
MIN
MAX
LIMITS
5.0
MIN
MAX
UNIT
T_SSI
T_RRI
T_SI
T_INT
T_WRI
T_SSR
T_RR
T_WT
T_SRT
T_RST
N
Delay From Stop To Set Interrupt
Delay From IOR# To Reset Interrupt
Delay From Stop To Interrupt
Delay From Initial INT Reset To Transmit Start
Delay From IOW# To Reset Interrupt
Delay From Stop To Set RXRDY#
Delay From IOR# To Reset RXRDY#
Delay From IOW# To Set TXRDY#
Delay From Center of Start To Reset TXRDY#
Reset Pulse Width
Baud Rate Divisor
1
1
1 Bclk
150
75
50 ns
150
75
50 ns
8
24
8
24
8
24 Bclk
150
75
50 ns
1
1
1 Bclk
150
75
50 ns
150
75
50 ns
8
8
8 Bclk
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
38