MC145406 Datasheet, PDF (1/12 Pages) NXP Semiconductors – EIA-232-D/V.28 driver/receiver

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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by MC145406/D
Driver/Receiver
EIA 232–E and CCITT V.28 (Formerly RS–232–D)
The MC145406 is a silicon–gate CMOS IC that combines three drivers
and three receivers to fulfill the electrical specifications of standards
EIA 232–E and CCITT V.28. The drivers feature true TTL input
compatibility, slew–rate–limited output, 300–Ω power–off source imped-
ance, and output typically switching to within 25% of the supply rails. The
receivers can handle up to ± 25 V while presenting 3 to 7 kΩ impedance.
Hysteresis in the receivers aids reception of noisy signals. By combining
both drivers and receivers in a single CMOS chip, the MC145406 provides
efficient, low–power solutions for EIA 232–E and V.28 applications.
Drivers
• ± 5 V to ±12 V Supply Range
• 300–Ω Power–Off Source Impedance
• Output Current Limiting
• TTL Compatible
• Maximum Slew Rate = 30 V/µs
Receivers
• ± 25 V Input Voltage Range When VDD = 12 V, VSS = – 12 V
• 3 to 7 kΩ Input Impedance
• Hysteresis on Input Switchpoint
MC145406
16
1
16
1
P SUFFIX
PLASTIC
CASE 648
DW SUFFIX
SOG
CASE 751G
SD SUFFIX
SSOP
CASE 940B
BLOCK DIAGRAM
VDD
RECEIVER
VDD
*
VCC
15 kΩ
Rx
+
–
5.4 k
VSS
VCC
DO
1.0 V
1.8 V
HYSTERESIS
VDD
DRIVER
VCC
300 Ω
Tx
LEVEL
SHIFT
+
DI
– 1.4 V
PIN ASSIGNMENT
VDD 1
16 ^VCC
Rx1 ^{2 R}
15
DO1
3
Tx1
D ¹⁴ DI1
Rx2 ^{4 R}
13 _DO2
Tx2 ⁵
D ¹² DI2
6
Rx3
7
Tx3
R
11 _DO3
D ¹⁰ DI3
VSS 8
9 ^GND
D = DRIVER
R = RECEIVER
VSS
*Protection circuit
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REV 4
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MC145406
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