TL/H/9223
L
December 1994
LM6121/LM6221/LM6321 High Speed Buffer
General Description
These high speed unity gain buffers slew at 800 V/
m
s and
have a small signal bandwidth of 50 MHz while driving a
50
X
load. They can drive
g
300 mA peak and do not oscil-
late while driving large capacitive loads. The LM6121 family
are monolithic ICs which offer performance similar to the
LH0002 with the additional features of current limit and ther-
mal shutdown.
These buffers are built with National’s VIP
TM
(Vertically Inte-
grated PNP) process which provides fast PNP transistors
that are true complements to the already fast NPN devices.
This advanced junction-isolated process delivers high
speed performance without the need for complex and ex-
pensive dielectric isolation.
Features
Y
High slew rate
800 V/
m
s
50 MHz
Y
Wide bandwidth
Y
Slew rate and bandwidth 100% tested
Y
Peak output current
g
300 mA
5 M
X
Y
High input impedance
Y
LH0002H pin compatible
Y
No oscillations with capacitive loads
Y
5V to
g
15V operation guaranteed
Y
Current and thermal limiting
Y
Fully specified to drive 50
X
lines
Applications
Y
Line Driving
Y
Radar
Y
Sonar
Simplified Schematic
Connection Diagrams
TL/H/9223–1
Numbers in ( ) are for 8-pin N DIP.
Plastic DIP
TL/H/9223–2
*
Heat-sinking pins. See Application
section on heat sinking require-
ments.
Order Number LM6221N,
LM6321N or LM6121J/883
See NS Package
Number J08A or N08E
Plastic SO
TL/H/9223–7
*
Pin 3 must be connected to the negative supply.
**
Heat-sinking pins. See Application section on heat-sinking requirements.
These pins are at V
b
potential.
Order Number LM6321M
See NS Package Number M14A
Metal Can
TL/H/9223–3
Top View
Note:
Pin 6 connected to case.
Order Number LM6221H or
LM6121H/883
See NS Package
Number H08C
VIP
TM
is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M75/Printed in U. S. A.