PC16550DN National Semiconductor, PC16550DN Datasheet - Page 5

• Manufacturer Part Number: PC16550DN
• Description: UART IC
• Manufacturer: National Semiconductor

Specifications of PC16550DN

• Transceiver Type: RS232
• Mounting Type: Through Hole
• Peak Reflow Compatible (260 C): No
• Ic Function: UART IC
• Supply Voltage: 5V
• No. Of Transceivers: 1
• Data Rate Max: 128Kbps
• Leaded Process Compatible: No
• Supply Current: 15mA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3 0 AC Electrical Characteristics
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)
Note 2 These specifications are preliminary
4 0 Timing Waveforms
Note 1 The 2 4V and 0 4V levels are the voltages that the inputs are driven to during AC testing
Note 2 The 2 0V and 0 8V levels are the voltages at which the timing tests are made
Symbol
Transmitter
t
t
t
t
t
t
t
Modem Control
t
t
t
HR
IR
IRS
SI
STI
SXA
WXI
MDO
RIM
SIM
External Clock Input (24 0 MHz Max )
Delay from WR WR (WR THR)
to Reset Interrupt
Delay from RD RD (RD IIR) to Reset
Interrupt (THRE)
Delay from Initial INTR Reset to Transmit
Start
Delay from Initial Write to Interrupt
Delay from Stop to Interrupt (THRE)
Delay from Start to TXRDY active
Delay from Write to TXRDY inactive
Delay from WR WR (WR MCR) to
Output
Delay from RD RD to Reset Interrupt
(RD MSR)
Delay from MODEM Input to Set Interrupt
Parameter
(All timings are referenced to valid 0 and valid 1)
TL C 8652 – 2
BAUDOUT Timing
(Continued)
5
100 pF Load
100 pF Load
100 pF Load
100 pF Load
100 pF Load
100 pF Load
100 pF Load
Conditions
(Note 1)
(Note 1)
Min
AC Test Points
16
8
8
Max
175
250
195
200
250
250
24
24
8
8
TL C 8652 – 4
BAUDOUT
BAUDOUT
BAUDOUT
BAUDOUT
TL C 8652– 3
Cycles
Cycles
Cycles
Cycles
Units
ns
ns
ns
ns
ns
ns