DM74ALS169BMX [ROCHESTER]
Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, PDSO16, 0.150 INCH, MS-012AC, SOIC-16;
| 型号： | DM74ALS169BMX |
| 厂家： | 
Rochester Electronics |
| 描述： | Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, PDSO16, 0.150 INCH, MS-012AC, SOIC-16 光电二极管 输出元件 逻辑集成电路 触发器 |
| 文件： | 总7页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 2007
DM74ALS169B
tm
Synchronous Four-Bit Up/Down Counters
Features
General Description
■ Switching specifications at 50pF
These synchronous presettable counters feature an inter-
nal carry look ahead for cascading in high speed counting
applications. The DM74ALS169B is a four-bit binary up/
down counter. The carry output is decoded to prevent
spikes during normal mode of counting operation. Syn-
chronous operation is provided so that outputs change
coincident with each other when so instructed by count
enable inputs and internal gating. This mode of operation
eliminates the output counting spikes which are normally
associated with asynchronous (ripple clock) counters. A
buffered clock input triggers the four flip-flops on the rising
(positive going) edge of clock input waveform.
■ Switching specifications guaranteed over full
temperature and V range
CC
■ Advanced oxide-isolated, ion-implanted Schottky TTL
process
■ Functionally and pin-for-pin compatible with Schottky
and low power Schottky TTL counterpart
■ Improved AC performance over Schottky and low
power Schottky counterparts
■ Synchronously programmable
■ Internal look ahead for fast counting
■ Carry output for n-bit cascading
■ Synchronous counting
These counters are fully programmable; that is, the out-
puts may each be preset either HIGH or LOW. The load
input circuitry allows loading with carry-enable output of
cascaded counters. As loading is synchronous, setting up
a low level at the load input disables the counter and
causes the outputs to agree with the data inputs after the
next clock pulse.
■ ESD inputs
The carry look-ahead circuitry permits cascading counters
for n-bit synchronous applications without additional gat-
ing. Both count enable inputs (P and T) must be LOW to
count. The direction of the count is determined by the
level of the up/down input. When the input is HIGH, the
counter counts UP; when LOW, it counts DOWN. Input T
is fed forward to enable the carry outputs. The carry out-
put thus enabled will produce a low level output pulse with
a duration approximately equal to the high portion of the
Q output when counting UP, and approximately equal to
A
the low portion of the Q when counting DOWN. This low
A
level overflow carry pulse can be used to enable succes-
sively cascaded stages. Transitions at the enable P or T
inputs are allowed regardless of the level of the clock
input.
The control functions for these counters are fully synchro-
nous. Changes at control inputs (enable P, enable T, load,
up/down) which modify the operating mode have no effect
until clocking occurs. The function of the counter (whether
enabled, disabled, loading or counting) will be dictated
solely by the conditions meeting the stable setup and hold
times.
Ordering Information
Order
Number
Package
Number
Package Description
DM74ALS169BM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering number.
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
Connection Diagram
Mode Select Table
LOAD
EP
X
ET
X
U/D
X
Action on Rising Clock Edge
L
Load (P → Q )
n n
H
H
H
H
L
L
H
Count Up (Increment)
Count Down (Decrement)
No Change (Hold)
L
L
L
H
X
X
X
H
X
No Change (Hold)
State Diagram
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
2
Logic Diagram
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
3
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
Rating
V
Supply Voltage
Input Voltage
7V
7V
CC
V
I
T
Operating Free Air Temperature Range
Storage Temperature Range
0°C to +70°C
–65°C to +150°C
106.8°C/W
A
T
STG
θ
Typical Thermal Resistance
JA
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Min
4.5
2
Nom
Max
Units
V
V
Supply Voltage
5
5.5
CC
V
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
V
IH
V
0.8
–0.4
8
V
IL
I
mA
mA
MHz
ns
OH
I
OL
f
Clock Frequency
0
40
CLK
(1)
t
Setup Time
Data: A, B, C, D
15↑
15↑
15↑
15↑
0↑
6
SU
En P, En T
Load
8
8
U/D
10
–3
–3
–4
–4
(1)
t
Hold Time
Data: A, B, C, D
En P, En T
Load
ns
ns
H
0↑
0↑
U/D
0↑
t
Width of Clock Pulse
13
W
Note:
1. The symbol (↑) indicates that the rising edge of the clock is used as reference.
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
4
Electrical Characteristics
Over recommended operating free air temperature range. All typical values are measured at V = 5V, T = 25°C.
CC
A
Max.
–1.5
Symbol
Parameter
Conditions
Min.
Typ.
Units
V
Input Clamp Voltage
V
= 4.5V, I = –18mA
V
V
IK
CC
I
V
HIGH Level Output Voltage I = –0.4mA, V = 4.5V to 5.5V
V
– 2
OH
OH
CC
CC
V
LOW Level Output Voltage
V
= 4.5V, I = 8mA
0.35
0.5
0.1
V
OL
CC
CC
OL
I
Input Current @ Max. Input
Voltage
V
= 5.5V, V = 7V
mA
I
IH
I
HIGH Level Input Current
LOW Level Input Current
Output Drive Current
Supply Current
V
V
V
V
= 5.5V, V = 2.7V
20
–0.2
–112
25
µA
mA
mA
mA
IH
CC
CC
CC
CC
IH
I
= 5.5V, V = 0.4V
IL
IL
I
= 5.5V, V = 2.25V
–30
To
O
O
I
= 5.5V
15
CC
Switching Characteristics
Over recommended operating free air temperature range.
Symbol Parameter
Conditions
From
Min. Max. Units
f
Maximum Clock Frequency
40
3
MHz
ns
MAX
t
Propagation Delay Time,
LOW-to-HIGH Level Output
V
= 4.5V to 5.5V,
Clock
Clock
Clock
Clock
En T
Ripple Carry
Ripple Carry
Any Q
20
20
15
20
13
16
19
19
PLH
PHL
PLH
PHL
PLH
PHL
PLH
PHL
CC
R = 500Ω,
C = 50pF
L
t
Propagation Delay Time,
HIGH-to-LOW Level Output
6
2
5
2
3
5
5
ns
ns
ns
ns
ns
ns
ns
L
t
t
t
t
t
t
Propagation Delay Time,
LOW-to-HIGH Level Output
Propagation Delay Time,
HIGH-to-LOW Level Output
Any Q
Propagation Delay Time,
LOW-to-HIGH Level Output
Ripple Carry
Ripple Carry
Ripple Carry
Ripple Carry
Propagation Delay Time,
HIGH-to-LOW Level Output
En T
(2)
Propagation Delay Time,
LOW-to-HIGH Level Output
U/D
(2)
Propagation Delay Time,
U/D
HIGH-to-LOW Level Output
Note:
2. Propagation delay time from up/down to ripple carry must be measured with the counter at either a minimum or a
maximum count. As the logic level of the up/down input is changed, the ripple carry output will follow. If the count is
minimum (0), the ripple carry output transition will be in phase. If the count is maximum, the ripple carry output will
be out of phase.
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
5
Physical Dimensions
Dimensions are in millimeters unless otherwise noted.
Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
Package Number M16A
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
6
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2.
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
Advance Information
Formative or In Design
This datasheet contains preliminary data; supplementary data will be
published at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
Preliminary
First Production
Full Production
Not In Production
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the right to make changes at any time without notice to improve design.
No Identification Needed
Obsolete
This datasheet contains specifications on a product that has been
discontinued by Fairchild semiconductor. The datasheet is printed for
reference information only.
Rev. I28
©1984 Fairchild Semiconductor Corporation
DM74ALS169B Rev. 1.2
www.fairchildsemi.com
7
相关型号：
DM74ALS169BMX_NL
Binary Counter, ALS Series, Synchronous, Positive Edge Triggered, 4-Bit, Bidirectional, TTL, PDSO16, 0.150 INCH, MS-012AC, SOIC-16
FAIRCHILD
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