Semiconductor Components Industries, LLC, 2001
October, 2001 – Rev. 8 1Publication Order Number:
SN74LS377/D
SN74LS377
Octal D Flip-Flop
with Enable
The SN74LS377 is an 8-bit register built using advanced Low
Power Schottky technology. This register consists of eight D-type
flip-flops with a buffered common clock and a buffered common
clock enable.
•8-Bit High Speed Parallel Registers
•Positive Edge-Triggered D-Type Flip Flops
•Fully Buffered Common Clock and Enable Inputs
•True and Complement Outputs
•Input Clamp Diodes Limit High Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
IOH Output Current – High –0.4 mA
IOL Output Current – Low 8.0 mA
LOW
POWER
SCHOTTKY
http://onsemi.com
PDIP–20
N SUFFIX
CASE 738
20 1
20
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
SN74LS377N
AWLYYWW
MARKING
DIAGRAMS
LS377
AWLYYWW
SOIC–20
DW SUFFIX
CASE 751D
1
1
Device Package Shipping
ORDERING INFORMATION
SN74LS377N PDIP–20 1440 Units/Box
SN74LS377DW SOIC–WIDE 38 Units/Rail
SN74LS377DWR2 SOIC–WIDE 2500/Tape & Reel
SN74LS377
http://onsemi.com
2
CONNECTION DIAGRAM DIP (TOP VIEW)
Enable (Active LOW) Input
Data Inputs
Clock (Active HIGH Going Edge) Input
True Outputs
Complemented Outputs
E
D0 - D3
CP
Q0 - Q3
Q0 - Q3
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
5 U.L.
5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW.
HIGH LOW
(Note a)
LOADING
PIN NAMES
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual InLine Package.
18 17 16 15 14 13
123 4 567
20 19
8
VCC
E
Q7D7D6Q6D5
Q5D4
Q0D0D1Q1Q2D2D3
910
Q3GND
12 11
Q4CP
LOGIC DIAGRAM
E
ENABLE
D0D1D2D3D4D5D6D7
Q0Q1Q2Q3Q4Q5Q6Q7
CP
CLOCK
CP D
Q
14
26
7
3 84
5 9 12 16
13 17
CP D
Q
CP D
Q
CP D
Q
CP D
Q
CP D
Q
CP D
Q
CP D
Q
18
15 19
1
11
SN74LS377
http://onsemi.com
3
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage 0.8 VGuaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH Output HIGH Voltage 2.7 3.5 V VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
V
Output LOW Voltage
0.25 0.4 V IOL = 4.0 mA VCC = VCC MIN,
VIN VIL or VIH
VOL Output LOW Voltage 0.35 0.5 V IOL = 8.0 mA VIN = VIL or VIH
per Truth Table
I
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current 0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1.) –20 –100 mA VCC = MAX
ICC Power Supply Current 28 mA VCC = MAX, NOTE 1
NOTE: W it h a l l i nputs o pen a nd G ND a pplied to a ll d ata a nd e nable i nputs, I CC is m easured a fter a m omentary G ND, t hen 4 .5 V i s applied to clock.
1. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
fMAX Maximum Clock Frequency 30 40 MHz
V 50V
tPLH
tPHL Propagation Delay,
Clock to Output 17
18 27
27 ns VCC = 5.0 V
CL = 15 pF
AC SETUP REQUIREMENTS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
tWAny Pulse Width 20 ns
tsData Setup Time 20 ns
t
Enable Setup Inactive — State 10 ns VCC = 5.0 V
ts
Enable
Setu
Time Active — State 25 ns
VCC
5
.
0
V
thAny Hold Time 5.0 ns
DEFINITION OF TERMS
SETUP TIME (ts) — is defined as the minimum time
required for the correct logic level to be present at the logic
input prior to the clock transition from LOW-to-HIGH in
order to be recognized and transferred to the outputs.
HOLD TIME (th) — is defined as the minimum time
following the clock transition from LOW-to-HIGH that the
logic level must be maintained at the input in order to ensure
continued recognition. A negative HOLD TIME indicates
that the correct logic level may be released prior to the clock
transition from LOW-to-HIGH and still be recognized.
SN74LS377
http://onsemi.com
4
TRUTH TABLE
E CP DnQnQn
H X No
Change No
Change
L H H L
L L L H
L = LOW Voltage Level
H = HIGH Voltage Level
X = Immaterial
AC WAVEFORM
*The shaded areas indicate when the input is permitted to
change for predictable output performance.
1.3 V
1.3 V
1.3 V
1.3 V 1.3 V
1.3 V
1/fmax tW
ts(H) th(H)
ts(L) th(L)
CP
tPHL
tPLH
D OR E
Q
*
SN74LS377
http://onsemi.com
5
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 738–03
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
M
L
J20 PL
M
B
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A25.66 27.171.010 1.070
B6.10 6.600.240 0.260
C3.81 4.570.150 0.180
D0.39 0.550.015 0.022
G2.54 BSC0.100 BSC
J0.21 0.380.008 0.015
K2.80 3.550.110 0.140
L7.62 BSC0.300 BSC
M0 15 0 15
N0.51 1.010.020 0.040

E
1.27 1.770.050 0.070
1
11
10
20
–A–
SEATING
PLANE
K
N
FG
D20 PL
–T–
M
A
M
0.25 (0.010) T
E
B
C
F
1.27 BSC0.050 BSC
SN74LS377
http://onsemi.com
6
PACKAGE DIMENSIONS
DW SUFFIX
PLASTIC SOIC PACKAGE
CASE 751D–05
ISSUE F
20
1
11
10
B20X
H10X
C
L
18X A1
A
SEATING
PLANE
hX 45
E
D
M
0.25 M
B
M
0.25 S
AS
B
T
eT
B
A
DIM MIN MAX
MILLIMETERS
A2.35 2.65
A1 0.10 0.25
B0.35 0.49
C0.23 0.32
D12.65 12.95
E7.40 7.60
e1.27 BSC
H10.05 10.55
h0.25 0.75
L0.50 0.90
0 7
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL
BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT
MAXIMUM MATERIAL CONDITION.

SN74LS377
http://onsemi.com
7
Notes
SN74LS377
http://onsemi.com
8
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly , any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–0031
Phone: 81–3–5740–2700
Email: r14525@onsemi.com
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
SN74LS377/D
Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303–675–2175 or 800–344–3860 Toll Free USA/Canada
Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
N. American Technical Support: 800–282–9855 Toll Free USA/Canada