DM74AS640N

DM74AS640N Datasheet

DM74AS640 3-STATE Octal Bus Transceiver

Part	Datasheet
DM74AS640N	DM74AS640N (pdf)

Related Parts	Information
DM74AS640WMX	DM74AS640WMX

PDF Datasheet Preview
DM74AS640 3-STATE Octal Bus Transceiver DM74AS640 3-STATE Octal Bus Transceiver This advanced Schottky device contains 8 pairs of 3STATE logic elements configured as octal bus transceiver. This circuit is designed for use in memory, microprocessor systems and in asynchronous bidirectional data buses. This device transmits data from the A bus to the B bus, or vice versa, depending upon the logic level of the direction control input DIR . The enable input G can be used to disable the devices, effecting isolation of buses A and B. The 3-STATE circuitry also contains a protection feature that prevents these transceivers from glitching the bus during power-up or power-down. s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart s Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts s 3-STATE outputs independently controlled on A and B buses s Low output impedance drive to drive terminated transmission lines to s Specified to interface with CMOS at VOH = VCC − 2V Ordering Code: Order Number Package Number Package Description DM74AS640WM M20B 20-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-013, Wide DM74AS640N N20A 20-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Control Inputs H = HIGH Logic Level L = LOW Logic Level X = Immaterial Logic Diagram Operation B Data to A Bus A Data to B Bus Isolation Top View 2000 Fairchild Semiconductor Corporation DS006708 DM74AS640 Absolute Maximum Ratings Note 1 Supply Voltage Input Voltage Control Inputs I/O Ports 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Typical N Package 51.5°C M Package 69.0°C Note 1 The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions VCC VIH VIL IOH IOL TA Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature −15 Electrical Characteristics over recommended operating free air temperature range unless otherwise noted Parameter Conditions VI VOH VOL II IO ICCH ICCL ICCZ Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current with Outputs HIGH Supply Current with Outputs LOW Supply Current with Outputs in 3-STATE VCC = Min, II = −18 mA VCC = 4.5V to 5.5V, IOH = −2 mA VCC = 4.5V, IOH = −3 mA VCC = 4.5V, IOH = Max VCC = Min, IOL = Max VCC = Max, VI = 7V, VI = 5.5V for A or B Ports VCC = Max VI = 2.7V Note 3 VCC = Max, VI = 0.4V Note 3 VCC = Max, VO = 2.25V VCC = Max Control Inputs A or B Ports Control Inputs A or B Ports

PDF Datasheet Preview

DM74AS640 3-STATE Octal Bus Transceiver

DM74AS640 3-STATE Octal Bus Transceiver

This advanced Schottky device contains 8 pairs of 3STATE logic elements configured as octal bus transceiver. This circuit is designed for use in memory, microprocessor systems and in asynchronous bidirectional data buses. This device transmits data from the A bus to the B bus, or vice versa, depending upon the logic level of the direction control input DIR . The enable input G can be used to disable the devices, effecting isolation of buses A and B.

The 3-STATE circuitry also contains a protection feature that prevents these transceivers from glitching the bus during power-up or power-down.
s Switching specifications at 50 pF
s Switching specifications guaranteed over full temperature and VCC range
s Advanced oxide-isolated, ion-implanted Schottky TTL process
s Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart
s Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts
s 3-STATE outputs independently controlled on A and B buses
s Low output impedance drive to drive terminated transmission lines to
s Specified to interface with CMOS at VOH = VCC − 2V
Ordering Code:

Order Number Package Number

Package Description

DM74AS640WM

M20B
20-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-013, Wide

DM74AS640N

N20A
20-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Function Table

Control Inputs

H = HIGH Logic Level L = LOW Logic Level X = Immaterial

Logic Diagram

Operation

B Data to A Bus A Data to B Bus

Isolation

Top View
2000 Fairchild Semiconductor Corporation DS006708

DM74AS640

Absolute Maximum Ratings Note 1

Supply Voltage

Input Voltage

Control Inputs

I/O Ports
5.5V

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range
−65°C to +150°C

Typical N Package
51.5°C

M Package
69.0°C

Note 1 The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Recommended Operating Conditions

VCC VIH VIL IOH IOL TA

Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature
−15

Electrical Characteristics
over recommended operating free air temperature range unless otherwise noted

Parameter

Conditions

VI VOH

VOL II

IO ICCH ICCL ICCZ

Input Clamp Voltage HIGH Level Output Voltage

LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current with Outputs HIGH Supply Current with Outputs LOW Supply Current with Outputs in 3-STATE

VCC = Min, II = −18 mA VCC = 4.5V to 5.5V, IOH = −2 mA VCC = 4.5V, IOH = −3 mA VCC = 4.5V, IOH = Max VCC = Min, IOL = Max VCC = Max, VI = 7V, VI = 5.5V for A or B Ports VCC = Max VI = 2.7V Note 3 VCC = Max, VI = 0.4V Note 3 VCC = Max, VO = 2.25V VCC = Max

Control Inputs A or B Ports Control Inputs A or B Ports

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Datasheet ID: DM74AS640N 513737