DM74ALS646WMX Fairchild Semiconductor, DM74ALS646WMX Datasheet

IC TRANSCVR TRI-ST 8BIT 24SOIC

DM74ALS646WMX

Manufacturer Part Number
DM74ALS646WMX
Description
IC TRANSCVR TRI-ST 8BIT 24SOIC
Manufacturer
Fairchild Semiconductor
Series
74ALSr
Datasheet

Specifications of DM74ALS646WMX

Logic Type
Registered Transceiver, Non-Inverting
Number Of Elements
1
Number Of Bits Per Element
8
Current - Output High, Low
15mA, 24mA
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
© 2001 Fairchild Semiconductor Corporation
DM74ALS646WM
DM74ALS646NT
DM74ALS646
Octal 3-STATE Bus Transceiver and Register
General Description
This device incorporates an octal bus transceiver and an
octal D-type register configured to enable multiplexed
transmission of data from bus to bus or internal register to
bus.
This bus transceiver features totem-pole 3-STATE outputs
designed specifically for driving highly-capacitive or rela-
tively low-impedance loads. The high-impedance state and
increased high-logic level drive provides this device with
the capability of being connected directly to and driving the
bus lines in a bus-organized system without the need for
interface or pull-up components. They are particularly
attractive for implementing buffer registers, I/O ports, bidi-
rectional bus drivers, and working registers.
The registers in the DM74ALS646 are edge-triggered D-
type flip-flops. On the positive transition of the clock (CAB
or CBA), the input bus data is stored into the appropriate
register. The CAB input controls the transfer of data into
the A register and the CBA input controls the B register.
The SAB and SBA control pins are provided to select
whether real-time data or stored data is transferred. A LOW
input level selects real-time data, and a HIGH level selects
stored data. The select controls have a “make before
break” configuration to eliminate a glitch which would nor-
mally occur in a typical multiplexer during the transition
between store and real-time data.
The enable G and direction control pins provide four modes
of operation: real-time data transfer from bus A to B, real-
time data transfer from bus B to A, real-time bus A and/or B
data transfer to internal storage, or internally stored data
transfer to bus A or B.
When the enable G pin is LOW, the direction pin selects
which bus receives data. When the enable G pin is HIGH,
both buses become disabled yet their input function is still
enabled.
Ordering Code
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
Package Number
M24B
N24C
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
DS009172
Features
Switching specifications at 50 pF
Switching specifications guaranteed over full tempera-
ture and V
Advanced oxide-isolated, ion-implanted Schottky TTL
process
3-STATE buffer outputs drive bus lines directly
Multiplexed real-time and stored data
Independent registers for A and B buses
Package Description
CC
range
October 1986
Revised June 2001
www.fairchildsemi.com

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DM74ALS646WMX Summary of contents

Page 1

... DM74ALS646NT N24C 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. © 2001 Fairchild Semiconductor Corporation Features Switching specifications Switching specifications guaranteed over full tempera- ...

Page 2

Connection Diagram Function Table Inputs G DIR CAB CBA SAB SBA H ...

Page 3

Absolute Maximum Ratings Supply Voltage Input Voltage Control Inputs I/O Ports Operating Free-Air Temperature Range Storage Temperature Range Typical JA N Package M Package Recommended Operating Conditions Symbol Parameter V Supply Voltage CC V HIGH Level Input Voltage IH V ...

Page 4

Switching Characteristics over recommended operating free air temperature range Symbol Parameter t Propagation Delay Time V PLH LOW-to-HIGH Level Output C t Propagation Delay Time R PHL HIGH-to-LOW Level Output T t Propagation Delay Time PLH LOW-to-HIGH Level Output t ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M24B 5 www.fairchildsemi.com ...

Page 6

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right ...

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