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TL16C554PN

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Texas Instruments UART, LQFP-80(12x12). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TL16C554PN

Texas Instruments · UART · LQFP-80(12x12)

TL16C554PN from Texas Instruments, in a LQFP-80(12x12). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 NC unconnected No internal connection.
2 DCDD input Channel D data carrier detect, active low, read as bit 7 of the modem status register.
3 RID input Channel D ring detect indicator, a low means the modem received a ring signal, read as bit 6 of the modem status register.
4 RXD input Channel D serial data input, disconnected from the external pin in loopback mode.
5 VCC power_in Power supply, 4.75 V to 5.25 V recommended.
6 INTN input Interrupt normal; high always enables the interrupts, low or floating enables them per OUT2 (MCR bit 3).
7 D0 bidirectional Data bus bit 0 (LSB), 3-state bidirectional.
8 D1 bidirectional Data bus bit 1, 3-state bidirectional.
9 D2 bidirectional Data bus bit 2, 3-state bidirectional.
10 NC unconnected No internal connection.
11 D3 bidirectional Data bus bit 3, 3-state bidirectional.
12 D4 bidirectional Data bus bit 4, 3-state bidirectional.
13 D5 bidirectional Data bus bit 5, 3-state bidirectional.
14 D6 bidirectional Data bus bit 6, 3-state bidirectional.
15 D7 bidirectional Data bus bit 7 (MSB), 3-state bidirectional.
16 GND power_in Signal and power ground.
17 RXA input Channel A serial data input, disconnected from the external pin in loopback mode.
18 RIA input Channel A ring detect indicator, a low means the modem received a ring signal, read as bit 6 of the modem status register.
19 DCDA input Channel A data carrier detect, active low, read as bit 7 of the modem status register.
20 NC unconnected No internal connection.
21 NC unconnected No internal connection.
22 DSRA input Channel A data set ready modem status input, read as bit 5 of the modem status register.
23 CTSA input Channel A clear to send modem status input, read as bit 4 of the modem status register.
24 DTRA output Channel A data terminal ready output, active low when the DTR bit of the modem control register is set.
25 VCC power_in Power supply, 4.75 V to 5.25 V recommended.
26 RTSA output Channel A request to send output, set high after reset.
27 INTA output Channel A external interrupt output, goes high when enabled and an interrupt needs service.
28 CSA input Channel A chip select, enables read and write operations to channel A.
29 TXA output Channel A transmit serial data output, set to the marking (high) state by reset.
30 NC unconnected No internal connection.
31 IOW input Write strobe, allows the CPU to write into the register selected by the address inputs.
32 TXB output Channel B transmit serial data output, set to the marking (high) state by reset.
33 CSB input Channel B chip select, enables read and write operations to channel B.
34 INTB output Channel B external interrupt output, goes high when enabled and an interrupt needs service.
35 RTSB output Channel B request to send output, set high after reset.
36 GND power_in Signal and power ground.
37 DTRB output Channel B data terminal ready output, active low when the DTR bit of the modem control register is set.
38 CTSB input Channel B clear to send modem status input, read as bit 4 of the modem status register.
39 DSRB input Channel B data set ready modem status input, read as bit 5 of the modem status register.
40 NC unconnected No internal connection.
41 NC unconnected No internal connection.
42 DCDB input Channel B data carrier detect, active low, read as bit 7 of the modem status register.
43 RIB input Channel B ring detect indicator, a low means the modem received a ring signal, read as bit 6 of the modem status register.
44 RXB input Channel B serial data input, disconnected from the external pin in loopback mode.
45 VCC power_in Power supply, 4.75 V to 5.25 V recommended.
46 A2 input Register select input bit 2, selects the ACE register to read or write.
47 A1 input Register select input bit 1, selects the ACE register to read or write.
48 A0 input Register select input bit 0, selects the ACE register to read or write.
49 NC unconnected No internal connection.
50 XTAL1 input Crystal input 1 or external clock input, up to 16 MHz clock frequency.
51 XTAL2 output Crystal output 2 or buffered clock output.
52 NC unconnected No internal connection.
53 RESET input Master reset, clears most ACE registers and disables the transmitter output and receiver input during reset.
54 RXRDY output Receive ready, goes low when the receive FIFO is full, usable as single or multitransfer DMA signal.
55 TXRDY output Transmit ready, goes low when the transmit FIFO is full, usable as single or multitransfer DMA signal.
56 GND power_in Signal and power ground.
57 RXC input Channel C serial data input, disconnected from the external pin in loopback mode.
58 RIC input Channel C ring detect indicator, a low means the modem received a ring signal, read as bit 6 of the modem status register.
59 DCDC input Channel C data carrier detect, active low, read as bit 7 of the modem status register.
60 NC unconnected No internal connection.
61 NC unconnected No internal connection.
62 DSRC input Channel C data set ready modem status input, read as bit 5 of the modem status register.
63 CTSC input Channel C clear to send modem status input, read as bit 4 of the modem status register.
64 DTRC output Channel C data terminal ready output, active low when the DTR bit of the modem control register is set.
65 VCC power_in Power supply, 4.75 V to 5.25 V recommended.
66 RTSC output Channel C request to send output, set high after reset.
67 INTC output Channel C external interrupt output, goes high when enabled and an interrupt needs service.
68 CSC input Channel C chip select, enables read and write operations to channel C.
69 TXC output Channel C transmit serial data output, set to the marking (high) state by reset.
70 IOR input Read strobe, a low level transfers the contents of the data bus to the external CPU bus.
71 NC unconnected No internal connection.
72 TXD output Channel D transmit serial data output, set to the marking (high) state by reset.
73 CSD input Channel D chip select, enables read and write operations to channel D.
74 INTD output Channel D external interrupt output, goes high when enabled and an interrupt needs service.
75 RTSD output Channel D request to send output, set high after reset.
76 GND power_in Signal and power ground.
77 DTRD output Channel D data terminal ready output, active low when the DTR bit of the modem control register is set.
78 CTSD input Channel D clear to send modem status input, read as bit 4 of the modem status register.
79 DSRD input Channel D data set ready modem status input, read as bit 5 of the modem status register.
80 NC unconnected No internal connection.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package LQFP-80(12x12)
Category Interface
Pins 80

CAD (KiCad official)

  • Symbol: TL16C554PN
  • Footprint: Package_QFP:LQFP-80_12x12mm_P0.5mm
  • 3D model: LQFP-80(12x12) (KiCad packages3D, STEP)
  • 3D model files: tl16c554pn-etched.step / tl16c554pn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tl16c554pn.step / tl16c554pn.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 607fc95ad43d0d41, retrieved 2026-10-11, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF