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PDF DS75325N Data sheet ( Hoja de datos )
| Número de pieza | DS75325N | |
| Descripción | Memory Drivers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1992
DS75325
Memory Drivers
General Description
The DS75325 is a monolithic memory driver which features
high current outputs as well as internal decoding of logic
inputs This circuit is designed for use with magnetic memo-
ries
The circuit contains two 600 mA sink-switch pairs and two
600 mA source-switch pairs Inputs A and B determine
source selection while the source strobe (S1) allows the
selected source turn on In the same manner inputs C and
D determine sink selection while the sink strobe (S2) allows
the selected sink turn on
Sink-output collectors feature an internal pull-up resistor in
parallel with a clamping diode connected to VCC2 This pro-
tects the outputs from voltage surges associated with
switching inductive loads
The source stage features Node R which allows extreme
flexibility in source current selection by controlling the
amount of base drive to each source transistor This method
of setting the base drive brings the power associated with
the resistor outside the package thereby allowing the circuit
to operate at higher source currents for a given junction
temperature If this method of source current setting is not
desired then Nodes R and RINT can be shorted externally
activating an internal resistor connected from VCC2 to Node
R This provides adequate base drive for source currents up
to 375 mA with VCC2 e 15V or 600 mA with VCC2 e 24V
Features
Y 600 mA output capability
Y 24V output capability
Y Dual sink and dual source outputs
Y Fast switching times
Y Source base drive externally adjustable
Y Input clamping diodes
Y TTL compatible
Connection Diagram
Truth Table
Dual-In-Line Package
Address Inputs
Source Sink
A BCD
L HXX
H LXX
X XLH
X XHL
X XXX
H HHH
Strobe Inputs
Outputs
Source Sink Source Sink
S1 S2 W X Y Z
L H ON OFF OFF OFF
L H OFF ON OFF OFF
H L OFF OFF ON OFF
H L OFF OFF OFF ON
H H OFF OFF OFF OFF
X X OFF OFF OFF OFF
H e High Level L e Low Level X e Irrelevant
Note Not more than one output is to be on at any one time
Top View
Order Number DS75325N
See NS Package Number N14A
TL F 9755 – 2
C1995 National Semiconductor Corporation TL F 9755
RRD-B30M115 Printed in U S A
1 page  
DC Test Circuits (Continued)
Note 1 Figure 3 and 4 parameters must be measured using pulse techniques tW e 200 ms duty cycle s2%
Test Table
C D S2
Y
Z
0 8V 4 5V 0 8V RL OPEN
4 5V 0 8V 0 8V OPEN
RL
FIGURE 4 VIL and Sink VSAT
TL F 9755 – 6
5
5 Page 
DC Test Circuits (Continued)
Note 1 The pulse generator has the following characteristics ZOUT e 50X duty cycle s 1%
Note 2 CL includes probe and jig capacitance
Voltage Waveforms
TL F 9755 – 13
Test Table
Parameter
Output Under Test
Input
Connect to 5V
tTLH and tTHL
Source Output W
Source Output X
A and S1
B and S1
B C D and S2
A C D and S2
FIGURE 10 Transition Times of Source Outputs
TL F 9755 – 14
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS75325N.PDF ] | |
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