Fairchild DM7438 service manual
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DM7438 • 7438
Quad 2-Input NAND Buffers with Open-Collector Outputs
DM7438 • 7438 Quad 2-Input NAND Buffers with Open-Collector Outputs
September 1986
Revised February 2000
General Description
This device contains four independent gates each of which
performs the logic N AND functio n. The open -collector outputs require external pull-up resistors for proper logical
operation.
Pull-Up Resistor Equations
Where: N1 (IOH) = total maximum output high c urrent
N
for all outputs tied to pull-up resistor
(IIH) = total maximum input high current for
2
all inputs tied to pull-up resistor
(IIL) = total maximum input low current for
N
3
all inputs tied to pull-up resistor
Ordering Code:
Order Number Package Number Package Description
DM7438M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM7438N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
7438SJ M14D 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering cod e.
Connection Diagram Function Table
Y = AB
Inputs Output
ABY
LLH
LHH
HLH
HHL
H = HIGH Logic Level
L = LOW Logic Level
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Absolute Maximum Ratings(Note 1)
Supply Voltage 7V
Input Voltage 5.5V
Output Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
DM7438 • 7438
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the c ondit ions
for actual device operation.
Recommended Operating Conditions
Symbol Parameter Min Nom Max Units
V
CC
V
IH
V
IL
V
OH
I
OL
T
A
Supply Voltage 4.75 5 5.25 V
HIGH Level Input Voltage 2 V
LOW Level Input Voltage 0.8 V
HIGH Level Output Voltage 5.5 V
LOW Level Ou tput Current 48 mA
Free Air Operating Temperature 0 70 °C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
V
I
V
I
I
I
I
I
I
CEX
OL
I
IH
IL
CCH
CCL
Input Clamp Voltage VCC = Min, II = −12 mA −1.5 V
HIGH Level VCC = Min, VO = 5.5V
Output Current VIL = Max
LOW Level VCC = Min, IOL = Max
Output Voltage VIH = Min
Input Current @ Max Input Voltage VCC = Max, VI = 5.5V 1 mA
HIGH Level Input Current VCC = Max, VI = 2.4V 40 µA
LOW Level Input Current VCC = Max, VI = 0.4V −1.6 mA
Supply Current with Outputs HIGH VCC = Max 5 8.5 mA
Supply Current with Outputs LOW VCC = Max 34 54 mA
Typ
(Note 2)
Max Units
250 µA
0.4 V
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol Parameter Conditions Min Max Units
t
PLH
t
PHL
Note 2: All typicals are at VCC = 5V, TA = 25°C.
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Propagation Delay Time CL = 45 pF
LOW-to-HIGH Level Output RL = 133Ω
Propagation Delay Time
HIGH-to-LOW Level Output
22 ns
18 ns
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