Datasheet

TL16C552A, TL16C552AM
DUAL ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH FIFO
SLLS189D – NOVEMBER 1994 – REVISED JANUARY 1999
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
t
d5
Delay time, interrupt THRE ↓ to SOUT ↓ at start See Figure 6 8 24
RCLK
cycles
t
d6
Delay time, SOUT ↓ at start to interrupt THRE ↑ See Note 12 and Figure 6 8 9
RCLK
cycles
t
d7
Delay time, IOW (WR THR) ↑ to interrupt THRE ↑ See Note 12 and Figure 6 16 32
RCLK
cycles
t
d8
Delay time, SOUT ↓ at start to TXRDY ↓
C
L
= 100 pF,
See Figures 7 and 8
8
RCLK
cycles
t
pd2
Propagation delay time from IOW (WR THR) ↓ to interrupt THRE ↓
C
L
= 100 pF,
See Figure 6
140 ns
t
pd4
Propagation delay time from IOR (RD IIR) ↑ to interrupt THRE ↓
C
L
= 100 pF,
See Figure 6
140 ns
t
pd5
Propagation delay time from IOW (WR THR) ↑ to TXRDY ↑
C
L
= 100 pF,
See Figures 7 and 8
195 ns
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 TEST CONDITIONS MIN MAX UNIT
t
d9
Delay time from stop to INT ↑ See Note 14 1
RCLK
cycle
t
pd6
Propagation delay time from RCLK ↑ to sample CLK ↑ 100 ns
t
pd7
Propagation delay time from IOR (RD RBR/RD LSR) ↓ to reset interrupt ↓ C
L
= 100 pF 150 ns
t
pd8
Propagation delay time from IOR (RD RBR) ↓ to RXRDY ↑ 150 ns
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
L
= 100 pF (see Note 15 and Figure 14)
PARAMETER MIN MAX UNIT
t
pd9
Propagation delay time from IOW (WR MCR) ↑ to RTS (DTR) ↓↑ 100 ns
t
pd10
Propagation delay time from modem input (CTS, DSR) ↓↑ to interrupt ↑ 170 ns
t
pd11
Propagation delay time from IOR (RD MSR) ↑ to interrupt ↓ 140 ns
t
pd12
Propagation delay time from RI ↑ to interrupt ↑ 170 ns
NOTE 15: These parameters are not production tested.