Schmitt Octal Bus Transceiver with Three-State Outputs
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
Three-state outputs drive bus line directly
1.2μ
CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 20-pin DIP
- 20-lead flatpack
UT54ACS245S - SMD 5962-96572
DESCRIPTION
The UT54ACS245S is a non-inverting octal bus transceiver with
Schmitt Trigger input levels. The circuit is designed for asyn-
chronous two-way communication between data buses. The
control function implementation minimizes external timing re-
quirements.
The device allows data transmission from the A bus to the B bus
or from the B bus to the A bus depending upon the logic level
at the direction control (DIR) input. The enable input (G) dis-
ables the device so that the buses are effectively isolated.
The device is characterized over full military temperature range
of -55°C to +125°C.
FUNCTION TABLE
ENABLE
G
L
L
H
DIRECTION
CONTROL DIR
L
H
X
OPERATION
B Data To A Bus
A Data To B Bus
Isolation
PINOUTS
20-Pin DIP
Top View
DIR
A1
A2
A3
A4
A5
A6
A7
A8
V
SS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
DD
G
B1
B2
B3
B4
B5
B6
B7
B8
20-Lead Flatpack
Top View
DIR
A1
A2
A3
A4
A5
A6
A7
A8
V
SS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
DD
G
B1
B2
B3
B4
B5
B6
B7
B8
LOGIC SYMBOL
G
DIR
(19)
(1)
G3
3 EN1 (BA)
3 EN2 (AB)
(18)
1
2
(17)
(16)
(15)
(14)
B1
B2
B3
B4
A1
A2
A3
A4
A5
A6
A7
A8
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
B5
(13)
B6
(12)
B7
(11)
B8
1
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
LOGIC DIAGRAM
DIR
(1)
(19)
G
A1
(2)
(18)
B1
A2
(3)
(17)
B2
A3
(4)
(16)
B3
A4
(5)
(15)
B4
A5
(6)
(14)
B5
A6
(7)
(13)
B6
A7
(8)
(12)
B7
A8
(9)
(11)
B8
2
OPERATIONAL ENVIRONMENT
1
PARAMETER
Total Dose
SEU Threshold
2
SEL Threshold
3
Neutron Fluence
LIMIT
1.0E6
80
120
1.0E14
UNITS
rads(Si)
MeV-cm
2
/mg
MeV-cm
2
/mg
n/cm
2
Notes:
1. Logic will not latchup during radiation exposure within the limits defined in the table.
2. Device storage elements are immune to SEU affects.
ABSOLUTE MAXIMUM RATINGS
SYMBOL
V
DD
V
I/O
T
STG
T
J
T
LS
Θ
JC
I
I
P
D
PARAMETER
Supply voltage
Voltage any pin
Storage Temperature range
Maximum junction temperature
Lead temperature (soldering 5 seconds)
Thermal resistance junction to case
DC input current
Maximum power dissipation
LIMIT
-0.3 to 7.0
-.3 to V
DD
+.3
-65 to +150
+175
+300
20
±10
1
UNITS
V
V
°C
°C
°C
°C/W
mA
W
Note:
1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, functional operation of the device at
these or any other conditions beyond limits indicated in the operational sections is not recommended. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
DD
V
IN
T
C
PARAMETER
Supply voltage
Input voltage any pin
Temperature range
LIMIT
4.5 to 5.5
0 to V
DD
-55 to + 125
UNITS
V
V
°C
3
DC ELECTRICAL CHARACTERISTICS
7
(V
DD
= 5.0V
±
10%; V
SS
= 0V
6
, -55°C < T
C
< +125°C); Unless otherwise noted, Tc is per the temperature range ordered.
SYMBOL
V
T
+
V
T
-
V
H
PARAMETER
Schmitt Trigger, positive going threshold
1
ACS
Schmitt Trigger, negative going threshold
1
ACS
Schmitt Trigger, typical range of hysteresis
2
CONDITION
MIN
MAX
.7V
DD
UNIT
V
V
.3V
DD
ACS
I
IN
V
OL
V
OH
I
OL
Input leakage current
ACS
Low-level output voltage
3
ACS
High-level output voltage
3
ACS
Output current (Sink)
10
V
IN
= V
DD
or V
SS
I
OL
= 100μA
I
OH
= -100μA
V
IN
=V
DD
or V
SS
V
OL
=0.4V
I
OH
Output current (Source)
10
V
IN
=V
DD
or V
SS
V
OH
=V
DD
- 0.4
I
OZ
I
OS
P
total
I
DDQ
C
IN
C
OUT
Three-state output leakage current
Short-circuit output current
2, 4
ACS
Power dissipation
2, 8, 9
Quiescent Supply Current
Input capacitance
5
Output capacitance
5
V
O
= V
DD
and V
SS
V
O
= V
DD
and V
SS
C
L
= 50pF
V
DD
= 5.5V
ƒ
= 1MHz @ 0V
ƒ
= 1MHz @ 0V
0.6
-1
1.5
1
V
μA
0.25
V
V
DD
- 0.25
12
V
mA
-12
mA
-30
30
μA
-300
300
2.0
10
15
15
mA
mW/
MHz
μA
pF
pF
4
Notes:
1. Functional tests are conducted in accordance with MIL-STD-883 with the following input test conditions: V
IH
= V
IH
(min) + 20%, - 0%; V
IL
= V
IL
(max) + 0%, -
50%, as specified herein, for TTL, CMOS, or Schmitt compatible inputs. Devices may be tested using any input voltage within the above specified range, but are
guaranteed to V
IH
(min) and V
IL
(max).
2. Supplied as a design limit, but not guaranteed or tested.
3. Per MIL-PRF-38535, for current density
≤
5.0E5 amps/cm
2
, the maximum product of load capacitance (per output buffer) times frequency should not exceed 3,765
pF/MHz.
4.Not more than one output may be shorted at a time for maximum duration of one second.
5.Capacitance measured for initial qualification and when design changes may affect the value. Capacitance is measured between the designated terminal and V
SS
at
frequency of 1MHz and a signal amplitude of 50mV rms maximum.
6. Maximum allowable relative shift equals 50mV.
7. All specifications valid for radiation dose
≤
1E6 rads(Si).
8. Power does not include power contribution of any TTL output sink current.
9. Power dissipation specified per switching output.
10.Guaranteed based on characterization data, but not tested.
[color=#000][font=Arial, 宋体] "The download resources on the Internet are too rubbish, time-consuming and laborious, someone should come out to take care of it!" I felt relieved after saying this. [/fo...
Basic Concepts of Modern Telecommunications Technology Wu Deben, Beijing University of Posts and Telecommunications : https://training.eeworld.com.cn/course/5164In this lecture, Professor Wu Deben fir...
(1) The major difference between the inverting input method and the non-inverting input method is: In the inverting input method, since a balanced resistor is connected to the ground at the non-invert...
I just got into +uclinux for work. I saw some information about linux, which mentioned "installing linux on PC". Isn't linux downloaded to the flash of arm? If so, isn't the bootloader also downloaded...
The following is the program/************************************************************ Program function: The ADC on the MCU converts the voltage of the P6.0 port and displays the analog voltage val...
As shown in the figure, we can work back to the value of Vor. When there are multiple windings, should we use formula 1, formula 2, or other formulas to count Vor? (ignore the diode voltage drop)....
The core of a machine vision system is image acquisition and processing. All information comes from images, and image quality is crucial to the entire vision system. A good image can improve the st...[Details]
Tesla and BYD, vying for dominance in the global electric vehicle market, are reportedly considering adopting Samsung's AMOLED (active-matrix organic light-emitting diode) technology for their next...[Details]
introduction
With the development of digital and network technologies, broadcasting technology has become increasingly diversified, with the most significant trend being the transition from an...[Details]
New energy pure electric vehicles generally accelerate faster than comparable fuel-powered vehicles, both from a standing start and while accelerating. Many believe this is simply due to the motor'...[Details]
On August 25th, TSMC, the world's leading contract chip manufacturer, attracted significant attention for its decision to build a chip manufacturing facility in Arizona. TSMC primarily manufactures...[Details]
Core point: The automotive industry chain and the humanoid robot industry have collaborative advantages in hardware, software, and scenarios. Upstream and downstream companies in the automotive ind...[Details]
On August 20th, Tiantai Robotics Co., Ltd., along with strategic partners including Shandong Future Robotics Technology Co., Ltd., Shandong Future Data Technology Co., Ltd., and Gangzai Robotics Gr...[Details]
introduction
The concept of the smart home is gradually developing and gaining market acceptance. We believe its ultimate form lies in the interconnection of all home appliances through open i...[Details]
Pure electric vehicles, structurally speaking, have components such as a power battery. In addition to the power battery, a small battery also powers some low-voltage electrical components and even...[Details]
With the advent of the electric car era, the number of pure electric vehicles has increased significantly, but many car owners do not know how to properly maintain pure electric vehicles. In additi...[Details]
One of the most core components of electric vehicles is the motor. The power supply provides electrical energy to the motor, which converts this electrical energy into mechanical energy, which in t...[Details]
China, August 21, 2025 – STMicroelectronics (NYSE: STM), a world-leading semiconductor company serving a wide range of electronics applications, has published its IFRS 2025 semi-annual financial re...[Details]
Methods of DC motor speed regulation:
1. The voltage regulator can be used to change the input voltage and speed directly, which is often used for large kilowatt-level motors.
2. Thyristo...[Details]
With the support and encouragement of national policies, some Internet car manufacturers have also joined the new energy vehicle manufacturing industry. From the perspective of new car manufacturer...[Details]
Charging is an essential topic for electric vehicles. Batteries are a core component of new energy vehicles. So, what's the optimal charge level for electric vehicles? Based on current battery tech...[Details]
Download Centre
京公网安备 11010802033920号
EEWORLD
