LM6121 LM6221 LM6321 High Speed Buffer
December 1994
LM6121 LM6221 LM6321 High Speed Buffer
General Description
These high speed unity gain buffers slew at 800 V
ms
and
have a small signal bandwidth of 50 MHz while driving a
50X 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鈥檚 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
Y
Y
Y
Y
Y
Y
Y
Y
Y
High slew rate
Wide bandwidth
Slew rate and bandwidth 100% tested
Peak output current
High input impedance
LH0002H pin compatible
No oscillations with capacitive loads
5V to
g
15V operation guaranteed
Current and thermal limiting
Fully specified to drive 50X lines
800 V
ms
50 MHz
g
300 mA
5 MX
Applications
Y
Y
Y
Line Driving
Radar
Sonar
Simplified Schematic
Connection Diagrams
Plastic DIP
Metal Can
TL H 9223 鈥?2
Heat-sinking pins See Application
section on heat sinking require-
ments
TL H 9223 鈥?3
Top View
Note
Pin 6 connected to case
Order Number LM6221N
LM6321N or LM6121J 883
See NS Package
Number J08A or N08E
Order Number LM6221H or
LM6121H 883
See NS Package
Number H08C
Plastic SO
TL H 9223 鈥?1
Numbers in ( ) are for 8-pin N DIP
TL H 9223 鈥?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
VIP
TM
is a trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL H 9223
RRD-B30M75 Printed in U S A