National
Sem iconductor
54LS299/DM74LS299
8-Input Universal Shift/Storage Register with Common Parallel I/O Pins
General Description
The ’LS299 is an 8-bit universal shift/storage register with TRI-STATE® outputs. Four modes of operation are possi
ble: hold (store), shift left, shift right and load data. The par
allel load inputs and flip-flop outputs are multiplexed to re
duce the total number of package pins. Separate outputs are provided for flip-flops QO and Q7 to allow easy cascad
ing. A separate active LOW Master Reset is used to reset the register.
Features
■ Common I/O for reduced pin count
■ Four operation modes: shift left, shift right, load and store
■ Separate shift right serial input and shift left serial input for easy cascading
■ TRI-STATE outputs for bus oriented applications
Connection Diagram
Dual-ln-Line Package
vcc si
DS7 -Q 7 -1 /0 7 -1 /0 5 -1 /0 3
- 1/01 - C P
— DS0
TL/F/9827-1 Order Number 54LS299DMQB, 54LS299FMQB, 54LS299LMQB, DM74LS299WM or DM74LS299N See NS Package Number E20A, J20A, M20B, N20A or W20A
s o - 1 20
0E1 — 2 19
0E2 — 3 18
I/06 — 4 17
I / 0 4 - 5 16
I/02 — 6 15
1/00 — 7 14
Q0 — 8 13
MR- 9 12
GND — 10 11
Pin Names Description
CP Clock Pulse Input (Active Rising Edge) DS0 Serial Data Input for Right Shift Ds7 Serial Data Input for Left Shift SO, S1 Mode Select Inputs
MR Asynchronous Master Reset Input (Active LOW)
OE1,OE2 TRI-STATE Output Enable Inputs (Active LOW)
I/O 0-I/O 7 Parallel Data Inputs or TRI-STATE Parallel Outputs
Q0-Q7 Serial Outputs
S 29 9
L S 29 Absolute Maximum Ratings
(Note)If Military /Aerospace specified devices are required, Note: The "Absolute Maximum Ratings” are those values please contact the National Semiconductor Sales beyond which the safety o f the device cannot be guaran- Office/Distributors for availability and specifications. teed. The device should not be operated a t these limits. The Supply Voltage 7V param etric values defined in the "Electrical Characteristics”
I t voltaae 10V ta^ e are not 9uaranteecf at the absolute maximum ratings.
P 9 The "Recommended Operating Conditions” table w ill define
Operating Free Air Temperature Range //?e conditions for actual device operation.
54 LS — 55°Cto + 125°C
DM74LS 0°C to+70°C
Storage T emperature Range - 65°C to + 1 50°C
Recommended Operating Conditions
Symbol Parameter 54LS299 DM74LS299
Units
Min Norn Max Min Norn Max
Vcc Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V|H High Level Input Voltage 2 2 V
V|L Low Level Input Voltage 0.7 0.8 V
•oh High Level Output Current -0 .4 -0 .4 mA
•OL Low Level Output Current 4 8 mA
t a Free Air Operating Temperature - 5 5 125 0 70 °C
ts(H) ts(L)
Setup Time HIGH or LOW SOorSI to CP
24 24
24
24 ns
th(H) th(L)
Hold Time HIGH or LOW SOorSI to CP
5 5
0
0 ns
ts(H) ts(L)
Setup Time HIGH or LOW l/O n, Dso. Ds7 to CP
15 15
10
10 ns
th(H) th(L)
Hold Time HIGH or LOW l/O n, Dso. Ds7 to CP
5 5
0
0 ns
tw(H) tw(L)
CP Pulse Width HIGH or LOW 15 15
15
15 ns
tw(L) MR Pulse Width LOW 15 15 ns
tree Recovery Time
MR to CP 10 10 ns
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min Typ
(Note 1) Max Units
V| Input Clamp Voltage Vcc = Min, l| = “ 18 mA -1 .5 V
VOH High Level Output Voltage
Vcc == Min, Ioh = Max V|l= Max
54 LS 2.5
V
DM74 2.7 3.4
VOL Low Level Output Voltage
Vcc = Min, Iol = Max V|h= Min
54LS 0.4
V
DM74 0.35 0.55
•ol = A mA, Vcc = Min DM74 0.25 0.4
•l Input Current @ Max Input Voltage
VCc = Max, V| = 10V Inputs 0.1 mA
Sn 0.2 mA
•lH High Level Input Current VCc = Max, V| = 2.7V Sn 40 juA
Electrical Characteristics
(continued)Over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min Typ
(Note 1) Max Units
los Short Circuit
Output Current
Vcc = Max (Note 2)
54 LS - 2 0 -1 0 0
mA
DM74 - 2 0 -1 0 0
Icc Supply Current VCc = Max, OE = 4.5V 60 mA
IOZH TRI-STATE Output Off Current High
Vcc = V CCH
VoZH = 2.7V 40 juA
•OZL TRI-STATE Output Off Current Low
Vcc = V CCH
VqZL “ °-4V -4 0 0 ju,A
Note 1: All typicals are at Vcc = 5V, Ta = 25°C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
Vcc = +5.0V, Ta = + 25°C (See Section 1 for waveforms and load configurations)
Symbol Parameter RL = 2 k a
CL = 15 pF Units
Min Max
fmax Maximum Input Frequency 35 MHz
tpLH tpHL
Propagation Delay CP to QO or Q7
26
28 ns
tpLH tpHL
Propagation Delay CPtol/O n
25
35 ns
tpHL Propagation Delay
MR to QO or Q7 28 ns
tpHL Propagation Delay
MR to l/O n 35 ns
tpZH tpZL
Output Enable Time 18
25 ns
tpHZ tpLZ
Output Disable Time 15
20 ns
Logic Symbol
11 18
I I
1--- --- 19---
so DS0 DS7
SI
CP Q7
0E MR QO 1/00 1/01 1/02 1/03 1/04 1/05 1/06 1/07
17
2- Cl \
3 - o
L J
? I I I I
9 8 7 13 6 Vcc : GND
I I I I I
14 5 15 4 1(
= Pin 20
= Pin 10
TL/F/9827-2
S 29 9
L S 29
Functional Description
The ’LS299 contains eight edge-triggered D-type flip-flops and the interstage logic necessary to perform synchronous shift left, shift right, parallel load and hold operations. The type of operation is determined by the SO and S1, as shown in the Mode Select Table. All flip-flop outputs are brought out through TRI-STATE buffers to separate I/O pins that also serve as data inputs in the parallel load mode. QO and Q7 are also brought out on other pins for expansion in serial shifting of longer words.
A LOW signal on MR overrides the Select and CP inputs and resets the flip-flops. All other state changes are initiated by the rising edge of the clock. Inputs can change when the clock is in either state provided only that the recommended setup and hold times, relative to the rising edge of CP, are observed.
A HIGH signal on either OE1 or OE2 disables the TRI
STATE buffers and puts the I/O pins in the high impedance state. In this condition the shift, hold, load and reset opera
tions can still occur. The TRI-STATE buffers are also dis
abled by HIGH signals on both SO and S1 in preparation for a parallel load operation.
Mode Select Table Inputs
Response MR S1 SO CP
L X X X Asynchronous Reset; Q0-Q7 = LOW H H H _ /■ Parallel Load; l/O n Qn
H L H Shift Right; Dso QO, QO —► Q1, etc.
H H L Shift Left; DS7 - > Q7, Q7 - * Q6, etc.
H L L X Hold
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
