Fairchild MM74HC125, MM74HC126 service manual
MM74HC125, MM74HC126 — 3-STATE Quad Buffers
February 2008
MM74HC125, MM74HC126
3-STATE Quad Buffers
Features
■
Typical propagation delay: 13ns
Wide operating voltage range: 2V–6V
■
■
Low input current: 1µA maximum
■
Low quiescent current: 80µA maximum (74HC)
Fanout of 15 LS-TTL loads
■
General Description
The MM74HC125 and MM74HC126 are general purpose 3-STATE high speed non-inverting buffers utilizing
advanced silicon-gate CMOS technology. They have
high drive current outputs which enable high speed operation even when driving large bus capacitances. These
circuits possess the low power dissipation of CMOS
circuitry, yet have speeds comparable to low power
Schottky TTL circuits. Both circuits are capable of driving
up to 15 low power Schottky inputs.
The MM74HC125 require the 3-STATE control input C to
be taken high to put the output into the high impedance
condition, whereas the MM74HC126 require the control
input to be low to put the output into high impedance.
All inputs are protected from damage due to static
discharge by diodes to V
and ground.
CC
Ordering Information
Package
Order Number
MM74HC125M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150"
MM74HC125SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC125MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
MM74HC125N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
MM74HC126M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150"
MM74HC126SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC126MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
MM74HC126N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Number Package Description
Narrow
4.4mm Wide
Narrow
4.4mm Wide
All packages are lead free per JEDEC: J-STD-020B standard.
©1983 Fairchild Semiconductor Corporation www.fairchildsemi.com
MM74HC125, MM74HC126 Rev. 1.3.0
Connection Diagrams
Top View (MM74HC125) Top View (MM74HC126)
MM74HC125, MM74HC126 — 3-STATE Quad Buffers
Pin Assignments for DIP, SOIC, SOP and TSSOP
Truth Tables
ACY
HLH
LLL
XHZ
Inputs Output
Inputs Output
ACY
HHH
LHL
XLZ
MM74HC125 MM74HC126
©1983 Fairchild Semiconductor Corporation www.fairchildsemi.com
MM74HC125, MM74HC126 Rev. 1.3.0 2
=
=
=
MM74HC125, MM74HC126 — 3-STATE Quad Buffers
Absolute Maximum Ratings
(1)
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol Parameter Rating
V
CC
V
IN
V
OUT
, I
I
IK
I
OUT
I
CC
T
STG
P
D
T
Notes:
1. Unless otherwise specified all voltages are referenced to ground.
2. Power Dissipation temperature derating — plastic “N” package: –12mW/°C from 65°C to 85°C.
Supply Voltage –0.5 to +7.0V
DC Input Voltage –1.5 to V
DC Output Voltage –0.5 to V
Clamp Diode Current ±20mA
OK
DC Output Current, per pin 35mA
DC V
or GND Current, per pin ±70mA
CC
Storage Temperature Range –65°C to +150°C
Power Dissipation
Note 2 600mW
S.O. Package only 500mW
Lead Temperature (Soldering 10 seconds) 260°C
L
CC
CC
+1.5V
+0.5V
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol Parameter Min. Max. Units
V
CC
V
, V
IN
T
A
t
, t
r
Supply Voltage 2 6 V
DC Input or Output Voltage 0 V
OUT
Operating Temperature Range –40 +85 °C
Input Rise or Fall Times
f
V
V
V
2.0V
CC
4.5V 500 ns
CC
6.0V 400 ns
CC
CC
1000 ns
V
©1983 Fairchild Semiconductor Corporation www.fairchildsemi.com
MM74HC125, MM74HC126 Rev. 1.3.0 3
Loading...