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PDF DS75361 Data sheet ( Hoja de datos )
| Número de pieza | DS75361 | |
| Descripción | Dual TTL-to-MOS Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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September 1992
DS75361 Dual TTL-to-MOS Driver
General Description
The DS75361 is a monolithic integrated dual TTL-to-MOS
driver interface circuit The device accepts standard TTL
input signals and provides high-current and high-voltage
output levels for driving MOS circuits It is used to drive
address control and timing inputs for several types of MOS
RAMs including the 1103 and MM5270 and MM5280
The DS75361 operates from standard TTL 5V supplies and
the MOS VSS supply in many applications The device has
been optimized for operation with VCC2 supply voltage from
16V to 20V however it is designed for use over a much
wider range of VCC2
Features
Y Capable of driving high-capacitance loads
Y Compatible with many popular MOS RAMs
Y VCC2 supply voltage variable over wide range to 24V
Y Diode-clamped inputs
Y TTL compatible
Y Operates from standard bipolar and MOS supplies
Y High-speed switching
Y Transient overdrive minimizes power dissipation
Y Low standby power dissipation
Schematic and Connection Diagrams
(1 2 shown)
Dual-In-Line Package
TL F 7557 – 3
Top View
TL F 7557 – 1
Order Number DS75361N
See NS Package Number N08E
C1995 National Semiconductor Corporation TL F 7557
RRD-B30M105 Printed in U S A
1 page  
Typical Applications
The fast switching speeds of this device may produce unde-
sirable output transient overshoot because of load or wiring
inductance A small series damping resistor may be used to
reduce or eliminate this output transient overshoot The
optimum value of the damping resistor to use depends on
the specific load characteristics and switching speed A typi-
cal value would be between 10X and 30X (Figure 3)
TL F 7557 – 6
FIGURE 2 Interconnection of DS75361 Devices with 1103 RAM
TL F 7557 – 7
Note RD 10X to 30X (Optional)
FIGURE 3 Use of Damping
Resistor to Reduce or Eliminate
Output Transient Overshoot in
Certain DS75361 Applications
Thermal Information
POWER DISSIPATION PRECAUTIONS
Significant power may be dissipated in the DS75361 driver
when charging and discharging high-capacitance loads over
a wide voltage range at high frequencies The total dissipa-
tion curve shows the power dissipated in a typical DS75361
as a function of load capacitance and frequency Average
power dissipated by this driver can be broken into three
components
PT(AV) e PDC(AV) a PC(AV) a PS(AV)
where PDC(AV) is the steady-state power dissipation with the
output high or low PC(AV) is the power level during charging
or discharging of the load capacitance and PS(AV) is the
power dissipation during switching between the low and
high levels None of these include energy transferred to the
load and all are averaged over a full cycle
The power components per driver channel are
PDC(AV)
e
PLtL
a
T
PHtH
PC(AV) C VC2 f
PS(AV)
e
PLHtLH
a
T
PHLtHL
where the times are defined in Figure 4
PL PH PLH and PHL are the respective instantaneous lev-
els of power dissipation and C is load capacitance
The DS75361 is so designed that PS is a negligible portion
of PT in most applications Except at very high frequencies
tL a tH n tLH a tHL so that PS can be neglected The total
dissipation curve for no load demonstrates this point The
power dissipation contributions from both channels are then
added together to obtain total device power
The following example illustrates this power calculation
technique Assume both channels are operating identically
with C e 200 pF f e 2 MHz VCC1 e 5V VCC2 e 20V and
duty cycle e 60% outputs high (tH T e 0 6) Also assume
VOH e 19 3V VOL e 0 1V PS is negligible and that the
current from VCC2 is negligible when the output is high
On a per-channel basis using data sheet values
J J (2 mA
0 mA
PDC(AV) e (5V) 2 a (20V) 2
(0 6) a
J J (16 mA
7 mA
(5V) a (20V)
22
(0 4)
PDC(AV) e 47 mW per channel
PC(AV) (200 pF) (19 2V)2 (2 MHz)
PC(AV) 148 mW per channel
For the total device dissipation of the two channels
PT(AV)
PT(AV)
2 (47 a 148)
390 mW typical for total package
FIGURE 4 Output Voltage Waveform
5
TL F 7557 – 8
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DS75361.PDF ] | |
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