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DM74LS293N
7 V, 4-bit binary counter
National
I Semiconductor
DM74LS293 4-Bit Binary Counter
General Description
The 'LS293 counter is electrically and functionally identical
to the 'LS93. Only the arrangement of the terminals has
been changed for the 1S293.
Each of these monolithic counters contains four master-
slave tlip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter tor which the
count cycle length is divide-by-eight.
All of these counters have a gated zero reset.
To use the maximum count length (four-bit binary) of these
counters, the B input is connected to the 0A output. The
input count pulses are applied to input A and the outputs are
as descnbed in the appropriate function table.
Features
I: GND and Vcc on Corner Pins (Pins 7 and 14
respectively)
n Typical power dissipation 45 mW
I: Count frequency 42 MHz
Connection Diagram
Dual-In-Llne Package
INPUT mpuv
Vcc R0(2) Ron) B A Ott thy
14 " " I 11 I 10 9 a
l1 I 2 l 3 4 5 ls l 7
NC NC NC A: the NC GND
TL/ F/6423-1
Order Number DM74LS293M or DM74LS293N
See NS Package Number M14A or N14A
Absolute Maximum Ratings (Note)
if MllltaryfNtrospaett specified devlces are requlred,
please contact the National Semiconductor Sales
Offlce/Dlstributors for avaliablllty and aptrttlReatlontt.
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range
DM74LS WC to + 70'C
Storage Temperature Range -65'C to + 15tt'C
Recommended Operating Conditions
Note: The "Absolute Maximum Ratings" are those values
beyond which the safety of the device cannot he guaran-
teed. The device should notbe operated at these limits. The
parametric values defined In the "Electrical Characteristics"
table are not guaranteed at the absolute maximum ratings.
The "Recommended Operating Conditions" table will define
the conditions for actual device operation.
Symbol Parameter DMNLS203 Units
Min Nom Max
Voc Supply Voltage 4.75 5 S.25 V
VIH High Level Input Voltage 2 V
VIL Low Level Input Voltage 0.8 V
lore High Level Output Current -0.4 mA
IOL Low Level Output Current 8 mA
fCLK Clock Frequency A to 0A 0 32 MHz
(Note1) Btoths o 16
tom Clock Frequency A to GA 0 20 MHz
(Note2) BtoQB 0 IO
tw Pulse Width A 15
(Note 6) B 30 ns
Reset 1 5
tREL Reset Release Time (Note 6) 25 ns
TA Free Air Operating Temperature 0 70 'C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Condltlons Min (N223) Max Units
V; Input Clamp Voltage Voc = Min, l. = -18 mA -1.5 V
VOH High Level Output Voc = Min, IOH = Max 2.7 3.4 V
Voltage VIL = Max, VIH = Min
Vor. 1d',1t,""h'ti'ut ite-rlai'llti?a1t'' 0.35 th5 V
IOL = 4mA, Vcc = Min 0.25 0.4
II Input Current @ Max V00 = Max Reset 0.1
InputVoltage V. = W A th2 mA
I.“ High Level Input Vcc = Max Reset 20
Current lh = 2.7V A 40 M
ht. Low Level Input Vcc = Max Reset -0.4
Current th = 0.4V A -2.4 mA
B -1.6
los tltr,tftteritent 2%:th ”Max - 20 - 100 tttA
ICC Supply Current Vcc = Max (Note 5) 9 15 mA
Swltchlng Characteristics at Vcc = 5V and TA = 25'C (See Section 1 for Test Waveforms and Output Load)
From (Input) Ru = 2 kn
Symbol Parameter Ta (Output) CL = 15 pF CL = 60 pF Unite
Mln Max Mln Max
tMAx Maximum Clock A to thx 32 20 MHz
Frequency B to th, 16 IO
tpLH Propagation Delay Time
Low to High Level Output A to GA 16 23 ns
tpHL Propagation Delay Time
High to Low Level Output A to 0A 18 30 ns
tpLH Propagation Delay Time
Low to High Level Output A to tho 70 87 ns
tPHL Propagation Delay Time
High to Low Level Output A to QD 70 93 ns
tpLH Propagation Delay Time
Low to High Level Output B to th 16 23 M
tpHL Propagation Delay Time
High to Low Level Output B to ths 21 35 ns
tpLH Propagation Delay Time
Low to High Level Output B to Ck: 32 48 ns
tpHL Propagation Delay Time
High to Low Lave! Output B to 00 35 53 ns
tpLH Propagation Delay Time
Low to High Level Output B to QD 51 71 ns
tpHL Propagation Delay Time
High to Low Level Output B to 00 51 71 ns
tPHL Propagation Delay Time SET-o to 40 53 ns
High to Low Level Output Any 0
Note It CL = 15 pF, RL 3 2 kn, TA = 25'C and Vcc = 5V.
Not. 2: CL = 50 pF, RL = 2 kn, TA = 25'C and Vcc = 5V.
Note 3: M lypicals are at Voc = w, TA = 25''C.
Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 5: Ice is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Note 6: TA = 25°C and Voc = 5V.
Function Tables
Count Sequence (See Note C)
Reaetfttttunt Truth Table
Count Outputs
00 th: 03 a, Reset Inputs Outputs
0 L L L L H0(1) ROW) th, 0c 03 tta
1 L L L H H H L L L L
2 L L H L L X COUNT
3 L L H H X L COUNT
4 L H L L H - High Level, L - Low Level, x " Don'tCm.
5 L H L H
6 L H H L
7 L H H H
8 H L L L
9 H L L H
10 H L H L
1 1 H L H H
12 H H L L
13 H H L H
14 H H H L
15 H H H H
Note Ct OutputOA is connected to Input 8.
Logic Diagram
INPUT A ------a >CLOCK
INPUT B
--chcuactt
Ftxotttt
TL/F/6423-2
Mole: The J and K inputs shown without connection are far reference only and are functionally at a high level.
8639'!
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
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This file is the datasheet for the following electronic components:
DM74LS293M - product/dm74|3293m?HQS=T|-nu|I-nu|I-dscataIog-df-pf-nuIl-wwe
DM74LS293N - product/dm74|3293n?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
