DM74LS245N

DM74LS245N Datasheet

DM74LS245 3-STATE Octal Bus Transceiver

Part	Datasheet
DM74LS245N	DM74LS245N (pdf)

Related Parts	Information
DM74LS245WM	DM74LS245WM

PDF Datasheet Preview
DM74LS245 3-STATE Octal Bus Transceiver DM74LS245 3-STATE Octal Bus Transceiver These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated. s Bi-Directional bus transceiver in a high-density 20-pin package s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at bus inputs improve noise margins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disable times 17 ns s IOL sink current 24 mA s IOH source current −15 mA Ordering Code: Order Number Package Number Package Description DM74LS245WM M20B 20-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-013, Wide DM74LS245SJ M20D 20-Lead Small Outline Package SOP , EIAJ TYPE II, 5.3mm Wide DM74LS245N 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 Enable G H = HIGH Level L = LOW Level X = Irrelevant Direction Control DIR L H X Operation B Data to A Bus A Data to B Bus Isolation 2000 Fairchild Semiconductor Corporation DS006413 DM74LS245 Absolute Maximum Ratings Note 1 Supply Voltage Input Voltage DIR or G A or B 5.5V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°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 Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature Electrical Characteristics over recommended operating free air temperature range unless otherwise noted Parameter Conditions Nom 5 Input Clamp Voltage VCC = Min, II = −18 mA Hysteresis VT+ − VT− VCC = Min HIGH Level VCC = Min, VIH = Min

PDF Datasheet Preview

DM74LS245 3-STATE Octal Bus Transceiver

DM74LS245 3-STATE Octal Bus Transceiver

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements.

The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control DIR input. The enable input G can be used to disable the device so that the buses are effectively isolated.
s Bi-Directional bus transceiver in a high-density 20-pin package
s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at bus inputs improve noise margins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disable times 17 ns s IOL sink current
24 mA s IOH source current
−15 mA
Ordering Code:

Order Number Package Number

Package Description

DM74LS245WM

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

DM74LS245SJ

M20D
20-Lead Small Outline Package SOP , EIAJ TYPE II, 5.3mm Wide

DM74LS245N

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

Enable G

H = HIGH Level L = LOW Level X = Irrelevant

Direction Control

DIR L H X

Operation

B Data to A Bus A Data to B Bus

Isolation
2000 Fairchild Semiconductor Corporation DS006413

DM74LS245

Absolute Maximum Ratings Note 1

Supply Voltage

Input Voltage

DIR or G

A or B
5.5V

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

Storage Temperature Range
−65°C to +150°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

Parameter

Supply Voltage

HIGH Level Input Voltage

LOW Level Input Voltage

HIGH Level Output Current

LOW Level Output Current

Free Air Operating Temperature

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

Parameter

Conditions

Nom 5

Input Clamp Voltage

VCC = Min, II = −18 mA

Hysteresis VT+ − VT−

VCC = Min

HIGH Level

VCC = Min, VIH = Min

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Datasheet ID: DM74LS245N 513782