Texas Instruments TL16C452FNR, TL16C452FN, TL16C451FNR, TL16C451FN Datasheet

TL16C451, TL16C452

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

Integrates Most Communications Card Functions From the IBM PC/AT or Compatibles With Single- or Dual-Channel Serial Ports

TL16C451 Consists of One TL16C450 Plus Centronix Printer Interface

TL16C452 Consists of Two TL16C450s Plus a Centronix-T ype Printer Interface

description

The TL16C451 and TL16C452 provide single- and dual-channel (respectively) serial interfaces along with a single Centronix-type parallel-port interface. The serial interfaces provide a serial-to-parallel conversion for data received from a peripheral device or modem and a parallel-to-serial conversion for data transmitted by a CPU. The parallel interface provides a bidirectional parallel data port that fully conforms to the requirements for a Centronix-type printer interface. A CPU can read the status of the asynchronous communications element (ACE) interfaces at any point in the operation. The status includes the state of the modem signals (CTS RLSD

, and RI) and any changes to these signals that have occurred since the last time they were read, the state of the transmitter and receiver including errors detected on received data, and printer status. The TL16C451 and TL16C452 provide control for modem signals (RTS and DTR), interrupt enables, baud rate programming, and parallel-port control signals.

Fully Programmable Serial Interface Characteristics: – 5-, 6-, 7-, or 8-Bit Characters – Even-, Odd-, or No-Parity Bit Generation

and Detection – 1-, 1 1/2-, or 2 Stop-Bit Generation – Programmable Baud Rate

(dc to 256 kbit/s)

Fully Double Buffered for Reliable Asynchronous Operation

, DSR,

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

IBM PC/AT is a trademark of International Business Machines Corporation.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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TL16C451, TL16C452 ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

TL16C451 ...FN PACKAGE

(TOP VIEW)

GND

9876543216867666564636261

GND

DB0

DB1

DB2

DB3

DB4

DB5

DB6

DB7

GND

RTS0 DTR0

SOUT0

NC – No internal connection

24 25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

GND

CTS0

RLSD0

GND

GNDVGND

CLK

RI0

CS0

DSR0

LPTOE

ACK

IOW

IOR

BUSY

SLCT

CS2

RESET

GND

ERROR

SIN0

GND

60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44

GND

NC INT2 SLIN INIT AFD STB GND PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7 INT0 BDO

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SOUT1

DTR1

RTS1

CTS1

DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7

GND

RTS0 DTR0

SOUT0

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

TL16C452 ...FN PACKAGE

(TOP VIEW)

LPTOE

ACK

GND

RLSD1

GND

9876543216867666564636261 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

RI1

CLK

DSR1

CS1

GND

BUSY

SLCT

ERROR

TL16C451, TL16C452

SLLS053C – MAY 1989 – REVISED AUGUST 1999

GND

SIN1

INT1

INT2

SLIN

INIT

AFD

STB

GND

PD0

PD1

PD2

PD3

PD4

PD5

PD6

PD7

INT0

BDO

GND

CTS0

RI0

RLSD0

CS0

DSR0

IOW

IOR

CS2

RESET

SIN0

GND

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TL16C451, TL16C452 ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

TL16C451 functional block diagram

TL16C451

CTS0

DSR0

RLSD0

RI0

SIN0

CS0

DB0–DB7

A0–A2

IOW

IOR

RESET

CLK

ERROR

SLCT

BUSY

ACK

LPTOE

CS2

35 – 33

36 37 39

Select

and

Control

Logic

28 31 29 30 41 32

14 – 21

63 65 66 67 68

ACE

Parallel

Port

Parallel

Port

24 25 26 45

53 – 46

57 56 55 58 59

RTS0 DTR0 SOUT0 INT0

BDO

PD0–PD7 INIT AFD STB SLIN INT2

TL16C452 functional block diagram

CTS0

DSR0

RLSD0

RI0

SIN0

CS0

DB0–DB7

CTS1

DSR1

RLSD1

RI1

SIN1

CS1

A0–A2

IOW

IOR

RESET

CLK

ERROR

SLCT

BUSY

ACK

LPTOE

CS2

35 – 33

36 37 39

Select

and

Control

Logic

14 – 21

28 31 29

30 41 32

63 65 66 67 68

5 8 6

TL16C452

ACE

Parallel

Port

24 25 26 45

12 11 10 60

53 – 46 57 56

55 58 59

RTS0 DTR0 SOUT0 INT0

RTS1 DTR1 SOUT1 INT1

BDO

PD0–PD7 INIT AFD STB SLIN INT2

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TL16C451, TL16C452

I/O

DESCRIPTION

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

Terminal Functions

TERMINAL

†

NAME

A0 A1 A2

ACK

AFD

BDO 44 O Bus buffer output. BDO is active (high) when the CPU is reading data. When active, this output can

BUSY 66 I Printer busy. BUSY is an input line from the printer that goes high when the printer is not ready to accept

CLK 4 I/O External clock. CLK connects the ACE to the main timing reference. CS0

CS1 [VCC] CS2

CTS0 CTS1 [GND]

DB0 – DB7 14 – 21

DSR0 DSR1 [GND]

DTR0 DTR1 [NC]

ERROR 63 I

INIT 57

INT0 INT1 [NC]

INT2 59 O

IOR

IOW

LPTOE

†

Names shown in brackets are for the TL16C451.

NO.

35 34 33

68 I

56 I/O

38 28

25 11

45 60

37 I

36 I

1 I

from or write to. Refer to T able 1 for register addresses, also refer to the chip select signals (CS0

CS2 Printer acknowledge. ACK goes low to indicate that a successful data transfer has taken place. It

generates a printer port interrupt during its positive transition. Printer autofeed. AFD is an open-drain line that provides the printer with a low signal when

continuous-form paper is to be autofed to the printer. An internal pullup is provided.

disable an external transceiver.

data.

Chip selects. Each chip select enables read and write operations to its respective channel. CS0 and

I/O Data bus. Eight 3-state data lines provide a bidirectional path for data, control, and status information

I/O

O Interrupt. INTx is an active-high 3-state output that is enabled by bit 3 of the MCR. When active, INTx

select serial channels 0 and 1, respectively, and CS2 selects the parallel port.

CS1

Clear to send. CTSx is an active-low modem status signal. Its state can be checked by reading bit 4 (CTS) of the modem status register. Bit 0 (DCTS) of the modem status register indicates that this signal has changed states since the last read from the modem status register. If the modem status interrupt is enabled when CTSx

between the TL16C451/TL16C452 and the CPU. DB0 is the least significant bit (LSB). Data set ready. DSRx is an active-low modem status signal. Its state can be checked by reading

bit 5 (DSR) of the modem status register. Bit 1 (DDSR) of the modem status register indicates that this signal has changed states since the last read from the modem status register. If the modem status interrupt is enabled when the DSRx

Data terminal ready. DTRx, when active (low), informs a modem or data set that the ACE is ready to establish communication. DTRx register. DTRx or clearing bit 0 (DTR) of the modem control register.

Printer error. ERROR is an input line from the printer. The printer reports an error by holding this line low during the error condition.

Printer initialize. INIT is an open-drain line that provides the printer with a signal that allows the printer initialization routine to be started. An internal pullup is provided.

informs the CPU that the ACE has an interrupt to be serviced. Four conditions that cause an interrupt to be issued are: a receiver error, received data is available, the transmitter holding register is empty, and an enabled modem status interrupt. The INTx output is reset (low) either when the interrupt is serviced or as a result of a reset.

Printer port interrupt. INT2 is an active-high 3-state output generated by the positive transition of ACK. It is enabled by bit 4 of the write control register.

Data read strobe. When IOR input is active (low) while the ACE is selected, the CPU is allowed to read status information or data from a selected ACE register.

Data write strobe. When IOW input is active (low) while the ACE is selected, the CPU is allowed to write control words or data into a selected ACE register.

Parallel data output enable. When low, LPT OE enables the write data register to the PD0–PD7 lines. A high puts the PD0–PD7 lines in the high-impedance state allowing them to be used as inputs. LPTOE is usually tied low for printer operation.

changes state, an interrupt is generated.

is placed in the active state by setting the DTR bit of the modem control

is placed in the inactive state either as a result of a reset or during loop mode operation

, CS1,

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TL16C451, TL16C452

I/O

DESCRIPTION

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

Terminal Functions (continued)

TERMINAL

†

NAME

PD0–PD7 53–46 I/O Parallel data bits (0–7). These eight lines provide a byte-wide input or output port to the system. The

PE 67 I Printer paper empty. This is an input line from the printer that goes high when the printer runs out of

RESET

RI0 RI1 [GND]

RLSD0 RLSD1 [GND]

RTS0 RTS1 [NC]

SIN0 SIN1 [GND]

SLCT 65 I Printer selected. SLCT is an input line from the printer that goes high when the printer has been selected. SLIN

SOUT0 SOUT1 [NC]

STB

GND 2,7,9

†

Names shown in brackets are for the TL16C451.

NO.

39 I

24 12

41 62

58 I/O

26 10

55 I/O

23,40,

22,27,42,

43,54,61

eight lines are held in a high-impedance state when LPTOE

paper. Reset. When active (low), RESET clears most ACE registers and sets the state of various output

signals. Refer to Table 2.

Ring indicator. RIx is an active-low modem status signal. Its state can be checked by reading bit 6 (RI) of the modem status register. Bit 2 (TERI) of the modem status register indicates that the RIx transitioned from a low to a high state since the last read from the modem status register. If the modem status interrupt is enabled when this transition occurs, an interrupt is generated.

Receive line signal detect. RLSDx is an active-low modem status signal. Its state can be checked by reading bit 7 of the modem status register. Bit 3 (DRLSD) of the modem status register indicates that this signal has changed states since the last read from the modem status register. If the modem status interrupt is enabled when RLSDx carrier is detected.

Request to send. When active (low), RTSx informs the modem or data set that the ACE is ready to transmit data. RTSx to its inactive (high) state either as a result of a reset or during loop mode operations or by clearing bit 1 (RTS) of the modem control register.

I Serial input. SINx is a serial data input from a connected communications device.

Printer select. SLIN is an open-drain line that selects the printer when it is active (low). An internal pullup is provided on this line.

I Serial output. SOUTx is a composite serial data output to a connected communication device. SOUTx

is set during a reset. Printer strobe. STB is an open-drain line that provides communication synchronization between the

TL16C451/TL16C452 and the printer . When it is active (low), it provides the printer with a signal to latch the data currently on the parallel port. An internal pullup is provided on this line.

5-V supply voltage

Supply common

is set to its active state by setting the RTS modem control register bit and is set

changes state, an interrupt is generated. This bit is low when a data

is high.

input has

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TL16C451, TL16C452

VOHHigh-level output voltage

2.4

Input leakage current

±10µA

All other in uts at 0.8 V,XTAL1 at 4 MHz

ASYNCHRONOUS COMMUNICATIONS ELEMENTS

SLLS053C – MAY 1989 – REVISED AUGUST 1999

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

†

Supply voltage range, VCC (see Note 1 ) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range at any input, VI –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output voltage range, VO –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation 1100 mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T Storage temperature range, T

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Case temperature for 10 seconds, TC 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND.

recommended operating conditions

MIN NOM MAX UNIT

Supply voltage, V High-level Input voltage, V Low-level Input voltage, V Operating free-air temperature, T

4.75 5 5.25 V 2 V

–0.5 0.8 V

0 70 °C

electrical characteristics over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

IOH = –0.4 mA on DB0–DB7

Ikg

†

All typical values are at VCC = 5 V, TA = 25°C.

NOTE 2: INIT

Low-level output voltage

High-impedance output current

Supply current

, AFD, STB, and SLIN are open-collector output terminals that each have an internal pullup to VCC. This generates a maximum of 2 mA of internal IOL per terminal. In addition to this internal current, each terminal sinks at least 10 mA while maintaining the V specification of 0.4 V maximum.

IOH = –2 mA to 4 mA on PD0–PD7 IOH = –0.2 mA on INIT, AFD, STB, and SLIN IOH = –0.2 mA on all other outputs IOL = 4 mA on DB0–DB7 IOL = 12 mA on PD0–PD7 IOL = 10 mA on INIT,

AFD, STB, and SLIN (see Note 2) IOL = 2 mA on all other outputs V

= 5.25 V, V

VI = 0 to 5.25 V, All other terminals floating VCC = 5.25 V, VSS = 0,

VO = 0 to 5.25 V, Chip selected and in write mode, or chip deselected

VCC = 5.25 V, VSS = 0, SIN, DSR, RLSD, CTS, and RI at 2 V,

No load on outputs, Baud rate = 50 kbit/s

= 0,

0.4 V

±20 µA

10 mA

system timing requirements over recommended ranges of supply voltage and operating free-air temperature

Cycle time, read (tw7 + td8 + td9) 175 ns

PARAMETER FIGURE MIN MAX UNIT

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