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PC16552D Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. PC16552D
Description  Dual Universal Asynchronous Receiver/Transmitter with FIFOs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC16552D Datasheet(HTML) 5 Page - National Semiconductor (TI)

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30 AC Electrical Characteristics TA e 0 Cto a70 C VDD ea5V g10% (Continued)
Symbol
Parameter
Conditions
Min
Max
Units
TRANSMITTER
tHR
Delay from WR (WR THR)
40
ns
to Reset Interrupt
tIR
Delay from RD (RD IIR) to Reset
40
ns
Interrupt (THRE)
tIRS
Delay from Initial INTR Reset
824
BAUDOUT
to Transmit Start
Cycles
tSI
Delay from Initial Write to Interrupt
(Note 1)
16
24
BAUDOUT
Cycles
tSTI
Delay from Start to Interrupt (THRE)
(Note 1)
8
BAUDOUT
Cycles
tSXA
Delay from Start to TXRDY Active
8
BAUDOUT
Cycles
tWXI
Delay from Write to TXRDY Inactive
25
ns
MODEM CONTROL
tMDO
Delay from WR (WR MCR)
40
ns
to Output
tRIM
Delay to Reset Interrupt from
78
ns
RD (RD MSR)
tSIM
Delay to Set Interrupt from MODEM Input
40
ns
Note 1
This delay will be lengthened by 1 character time minus the last stop bit time if the transmitter interrupt delay circuit is active (See FIFO Interrupt Mode
Operation)
40 Timing Waveforms All timings are referenced to valid 0 and valid 1
External Clock Input (24 MHz Max)
TLC9426 – 2
AC Test Points
TLC9426 – 3
Note 2
The 24V and 04V levels are the voltages that the inputs are driven to during AC testing
Note 3
The 20V and 08V levels are the voltages at which the timing tests are made
BAUDOUT Timing
TLC9426 – 4
5


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