Motorola MC145707DW, MC145705DW, MC145705P, MC145706DW, MC145706P Datasheet

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

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5 Volt Only Driver/Receiver with an Integrated Standby Mode

EIA±232±E and CCITT V.28

The MC145705/06/07 are a series of silicon±gate CMOS transceiver ICs that fulfill the electrical specifications of EIA±232±E and CCITT V.28 while operating from a single + 5 V power supply. These transceiver series are high performance and low power consumption devices that are equipped with standby and output enable function.

A voltage doubler and inverter convert the + 5 V to ± 10 V. This is accomplished through an on±board 20 kHz oscillator and four inexpensive external electrolytic capacitors.

The MC145705 is composed of two drivers and three receivers, the MC145706 has three drivers and two receivers, and the MC145707 has three drivers and three receivers. These drivers and receivers are virtually identical to those of the MC145407.

Available Driver/Receiver Combinations

Device	Drivers	Receivers	No. of Pins
MC145705	2	3	20
MC145706	3	2	20
MC145707	3	3	24

Drivers:

•±7.5 Output Swing

•300 Ω Power±Off Impedance

•Output Current Limiting

•TTL and CMOS Compatible Inputs

•Three±State Outputs During Standby Mode

•Hold Output OFF (MARK) State by TxEN Pin

Receivers:

•±25 V Input Range

•3 to 7 kΩ Input Impedance

•0.8 V Hysteresis for Enhanced Noise Immunity

•Three±State Outputs During Standby Mode

Charge Pumps:

•+ 5 to ± 10 V Dual Charge Pump Architecture

•Supply Outputs Capable of Driving Three Drivers on the MC145403/06 Simultaneously

•Requires Four Inexpensive Electrolytic Capacitors

•On±Chip 20 kHz Oscillators

MC145705

MC145706

MC145707

		P SUFFIX
		PLASTIC DIP
	20	CASE 738
	1
		DW SUFFIX
	20	SOG PACKAGE
		CASE 751D
	1
		P SUFFIX
		PLASTIC DIP
	24	CASE 724
	1
		DW SUFFIX
	24	SOG PACKAGE
		CASE 751E
	1
	ORDERING INFORMATION
	MC145705P	Plastic DIP
	MC145706P	Plastic DIP
	MC145707P	Plastic DIP
	MC145705DW	SOG Package
	MC145706DW	SOG Package
	MC145707DW	SOG Package

This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.

REV 1 8/95

Motorola, Inc. 1995

		MC145705
	2 DRIVERS/3 RECEIVERS
C2+	1	20	C1+
GND	2	19	VCC
C2±	3	18	C1±
VSS	4	17	VDD
STB	5	16	TxEN
Rx1	6	15	DO1
Rx2	7	14	DO2
Tx1	8	13	DI1
Rx3	9	12	DO3
Tx2	10	11	DI2

PIN ASSIGNMENTS

		MC145706
	3 DRIVERS/2 RECEIVERS
C2+	1	20	C1+
GND	2	19	VCC
C2±	3	18	C1±
VSS	4	17	VDD
STB	5	16	TxEN
Tx1	6	15	DI1
Rx1	7	14	DO1
Tx2	8	13	DI2
Rx2	9	12	DO2
Tx3	10	11	DI3

		MC145707
	3 DRIVERS/3 RECEIVERS
C2+	1	24	C1+
GND	2	23	VCC
C2±	3	22	C1±
VSS	4	21	VDD
STB	5	20	TxEN
NC	6	19	NC
Rx1	7	18	DO1
Tx1	8	17	DI1
Rx2	9	16	DO2
Tx2	10	15	DI2
Rx3	11	14	DO3
Tx3	12	13	DI3

NC = NO CONNECTION

MC145705•MC145706•MC145707

MOTOROLA

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FUNCTION DIAGRAM

CHARGE PUMPS

		OSC
VCC			GND
	VOLTAGE	VOLTAGE	+
C3	DOUBLER	INVERTER	C4
+
VDD	C1	C2	VSS
C1±	+ C1+	C2+ +	C2±

RECEIVER

VDD VDD

*	VCC
STB
15 kΩ
+	DO

±

5.4 kΩ VSS

1.0 V

* Protection Circuit				1.8 V

DRIVER

VDD

STB

TxEN

VCC

VCC

	300 Ω	LEVEL	+	DI
Tx
		SHIFT
			±	1.4 V

VSS

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MC145705•MC145706•MC145707

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MAXIMUM RATINGS (Voltage Polarities Referenced to GND)

Rating		Symbol	Value		Unit
DC Supply Voltage		VCC	± 0.5 to +	6.0	V
Input Voltage	Rx1 ± Rx3 Inputs	VIR	VSS ± 15 to VDD + 15		V
	DI1 ± DI3 Inputs		0.5 to VCC + 15
DC Current per Pin		I	± 100		mA
Power Dissipation		PD	1		W
Operating Temperature Range		TA	± 40 to +	85	°C
Storage Temperature Range		Tstg	± 85 to + 150		°C

RECOMMENDED OPERATING LIMITS

This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high±impedance circuit. For proper operation, it is recommended that the voltage at the DI and DO pins be constrained to the range

GND ≤ VDI ≤ VDD and GND ≤ VDO ≤ VCC. Also, the voltage at the Rx pin should be

constrained to (VSS ± 15 V) ≤ VRx1 ± Rx3 ≤ (VDD + 15 V), and Tx should be constrained

to VSS ≤ VTx1 ± Tx3 ≤ VDD.

Unused inputs must always be tied to an appropriate logic voltage level (e.g., GND or VCC for DI, and GND for Rx).

Parameter		Symbol	Min	Typ	Max	Unit
Power Supply		VCC	4.5	5	5.5	V
Operating Temperature Range		TA	± 40	Ð	85	°C
DC ELECTRICAL CHARACTERISTICS (Voltage polarities referenced to GND = 0 V; C1 ± C4 = 10 μF; TA = ± 40 to + 85°C)
Parameter		Symbol	Min	Typ	Max	Unit
DC Power Supply		VCC	4.5	5	5.5	V
Quiescent Supply Current (Output Unloaded, Input Low)		ICC	Ð	1.7	3.5	mA
Quiescent Supply Current (Standby Mode) (Output Unloaded, Input Open)		ICC(STB)	Ð	< 10	20	μA
Control Signal Input Voltage (STB, TxEN)	Logic Low	VIL	Ð	Ð	0.5	V
	Logic High	VIH	VCC ± 0.5	Ð	Ð
Control Signal Input Current	Logic Low (TxEN)	IIL	Ð	Ð	± 10	μA
	Logic High (STB)	IIH	Ð	Ð	10
Charge Pumps Output Voltage (C1, C2, C3, C4 = 10 μF)		VDD				V
Output Voltage (VDD)	Iload = 0 mA		8.5	10.0	11
	Iload = 5 mA		7.5	9.5	Ð
	Iload = 10 mA		6.0	9.0	Ð
Output Voltage (VSS)	Iload = 0 mA	VSS	± 8.5	± 10.0	± 11
	Iload = 5 mA		± 7.5	± 9.2	Ð
	Iload = 10 mA		± 6.0	± 8.6	Ð

RECEIVER ELECTRICAL SPECIFICATIONS

(Voltage polarities referenced to GND = 0 V; VCC = + 5 V ± 10%; C1 ± C4 = 10 μF; TA = ± 40 to + 85°C)

Parameter		Symbol	Min	Typ	Max	Unit
Input Turn±On Threshold (VDO1 ± DO3 = VOL)	Rx1 ± Rx3	Von	1.35	1.8	2.35	V
Input Turn±Off Threshold (VDO1 ± DO3 = VOH)	Rx1 ± Rx3	Voff	0.75	1	1.25	V
Input Threshold Hysteresis (Von = Voff)	Rx1 ± Rx3	Vhys	0.6	0.8	Ð	V
Input Resistance		Rin	3	5.4	7	kΩ
High±Level Output Voltage (DO1 ± DO3)	Iout = ± 20 μA	VOH	VCC ± 0.1	Ð	Ð	V
VRx1 ± Rx3 = ± 3 to ± 25 V	Iout = ± 1 mA		VCC ± 0.7	4.3	Ð
Low±Level Output Voltage (DO1 ± DO3)	Iout = + 20 μA	VOL	Ð	0.01	0.1	V
VRx1 ± Rx3 = + 3 to + 25 V	Iout = + 1.6 mA		Ð	0.5	0.7

MC145705•MC145706•MC145707

MOTOROLA

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