XR16V654_0709 Datasheet, PDF (44/58 Pages) Exar Corporation – 2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO

XR16V654/654D
2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO
AC ELECTRICAL CHARACTERISTICS
REV. 1.0.2
TA = -40^O TO +85^OC, VCC IS 2.25 TO 3.6V, 70 PF LOAD WHERE APPLICABLE
SYMBOL
PARAMETER
LIMITS
2.5V ± 10%
MIN
MAX
LIMITS
3.3V ± 10%
MIN
MAX
UNIT
T_SSI
T_RRI
T_SI
T_INT
Delay From Stop To Set Interrupt
Delay From IOR# To Reset Interrupt
Delay From Start To Interrupt
Delay From Initial INT Reset To Transmit Start
1
1
Bclk
45
45
ns
45
45
ns
8
24
8
24 Bclk
T_WRI
T_SSR
Delay From IOW# To Reset Interrupt
Delay From Stop To Set RXRDY#
45
45
ns
1
1
Bclk
T_RR
Delay From IOR# To Reset RXRDY#
45
45
ns
T_WT Delay From IOW# To Set TXRDY#
45
45
ns
T_SRT
T_RST
Bclk
Delay From Center of Start To Reset TXRDY#
Reset Pulse Width
Baud Clock
8
8
Bclk
40
40
ns
16X or 8X or 4X of data rate
Hz
FIGURE 15. CLOCK TIMING
EXTERNAL
CLOCK
CLK
CLK
OSC
44