TL16C552A, TL16C552AM
DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH FIFO
SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999
transmitter switching characteristics over recommended ranges of operating free-air temperature
and supply voltage (see Note 11 and Figures 6, 7, and 8)
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
RCLK
cycles
t
t
t
t
t
Delay time, interrupt THRE ↓ to SOUT ↓ at start
See Figure 6
8
24
d5
d6
d7
d8
pd2
RCLK
cycles
Delay time, SOUT ↓ at start to interrupt THRE ↑
Delay time, IOW (WR THR) ↑ to interrupt THRE ↑
Delay time, SOUT ↓ at start to TXRDY ↓
See Note 12 and Figure 6
See Note 12 and Figure 6
8
9
32
RCLK
cycles
16
C
= 100 pF,
RCLK
cycles
L
8
See Figures 7 and 8
C
= 100 pF,
L
Propagation delay time from IOW (WR THR) ↓ to interrupt THRE ↓
140
ns
ns
ns
See Figure 6
C
= 100 pF,
L
t
Propagation delay time from IOR (RD IIR) ↑ to interrupt THRE ↓
Propagation delay time from IOW (WR THR) ↑ to TXRDY ↑
140
195
pd4
pd5
See Figure 6
C
= 100 pF,
L
t
See Figures 7 and 8
NOTES: 11. These parameters are not production tested.
12. When the transmitter interrupt delay is active, this delay is lengthened by one character time minus the last stop bit time.
receiver switching characteristics over recommended ranges of operating free-air temperature
and supply voltage (see Note 13 and Figures 9 through 13)
PARAMETER
Delay time from stop to INT ↑
TEST CONDITIONS
MIN
MAX
UNIT
RCLK
cycle
t
d9
See Note 14
1
t
t
t
Propagation delay time from RCLK ↑ to sample CLK ↑
100
150
150
ns
ns
ns
pd6
pd7
pd8
Propagation delay time from IOR (RD RBR/RD LSR) ↓ to reset interrupt ↓
Propagation delay time from IOR (RD RBR) ↓ to RXRDY ↑
C = 100 pF
L
NOTES: 13. These parameters are not production tested.
14. The receiver data available indicator, the overrun error indicator, the trigger level interrupts, and the active RXRDY indicator are
delayed three RCLK cycles in FIFO mode (FCR0 = 1). After the first byte has been received, status indicators (PE, FE, BI) are
delayed three RCLK cycles. These indicators are updated immediately for any further bytes received after RDRBR goes active.
There are eight RCLK cycle delays for trigger change level interrupts.
modem control switching characteristics over recommended ranges of operating free-air
temperature and supply voltage, C = 100 pF (see Note 15 and Figure 14)
L
PARAMETER
MIN
MAX
100
170
140
170
UNIT
ns
t
t
t
t
Propagation delay time from IOW (WR MCR) ↑ to RTS (DTR) ↓↑
Propagation delay time from modem input (CTS, DSR) ↓↑ to interrupt ↑
Propagation delay time from IOR (RD MSR) ↑ to interrupt ↓
Propagation delay time from RI ↑ to interrupt ↑
pd9
ns
pd10
pd11
pd12
ns
ns
NOTE 15: These parameters are not production tested.
9
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