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74F845SPC PDF даташит

Спецификация 74F845SPC изготовлена ​​​​«Fairchild» и имеет функцию, называемую «8-Bit Transparent Latch».

Детали детали

Номер произв 74F845SPC
Описание 8-Bit Transparent Latch
Производители Fairchild
логотип Fairchild логотип 

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74F845SPC Даташит, Описание, Даташиты
April 1988
Revised August 1999
74F845
8-Bit Transparent Latch
General Description
The 74F845 bus interface latch is designed to eliminate the
extra packages required to buffer existing latches and pro-
vide extra data width for wider address/data paths or buses
carrying parity.
The 74F845 is functionally- and pin-compatible with AMD’s
Am29845.
Features
s 3-STATE outputs
s Direct replacement for AMD’s Am29845
Ordering Code:
Order Number Package Number
Package Description
74F845SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F845SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
© 1999 Fairchild Semiconductor Corporation DS009601
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74F845SPC Даташит, Описание, Даташиты
Unit Loading/Fan Out
Pin Names
D0–D7
O0–O7
OE1–OE3
LE
CLR
PRE
Description
Data Inputs
Data Outputs
Output Enables
Latch Enable
Clear
Preset
U.L.
HIGH/LOW
1.0/1.0
150/40
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
Input IIH/IIL
Output IOH/IOL
20 µA/0.6 mA
3.0 µA/24 mA
20 µA/0.6 mA
20 µA/0.6 mA
20 µA/0.6 mA
20 µA/0.6 mA
Functional Description
The 74F845 consists of eight D-type latches with 3-STATE
outputs. The flip-flops appear transparent to the data when
Latch Enable (LE) is HIGH. This allows asynchronous
operation as the output transition follows the data in transi-
tion. On the LE HIGH-to-LOW transition, the data that
meets the setup times is latched. Data appears on the bus
when the output Enable (OE) is LOW. When OE is HIGH,
the bus output is in the high impedance state.
Function Table
Inputs
CLR PRE OE LE
HHHX
H H HH
H H HH
HHHL
HH LH
HH LH
HH L L
HL LX
LHLX
L L LX
L HHL
H L HL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Internal Output
Function
DQ
O
XX
Z High Z
LL
Z High Z
HH
Z High Z
X NC
Z Latched
LL
L Transparent
HH
H Transparent
X NC
NC Latched
XH
H Preset
XL
L Clear
XH
H Preset
XL
Z Latched
XH
Z Latched
Z = High Impedance
NC = No Change
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74F845SPC Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 1)
Storage Temperature
65°C to +150°C
Ambient Temperature under Bias
55°C to +125°C
Junction Temperature under Bias
55°C to +150°C
VCC Pin Potential to Ground Pin
Input Voltage (Note 2)
0.5V to +7.0V
0.5V to +7.0V
Input Current (Note 2)
30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with VCC = 0V)
Standard Output
3-STATE Output
0.5V to VCC
0.5V to +5.5V
Current Applied to Output
in LOW State (Max)
twice the rated IOL (mA)
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to +70°C
+4.5V to +5.5V
Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
Parameter
Min
Typ
Max
Units
VCC
Conditions
VIH
VIL
VCD
VOH
VOL
IIH
IBVI
ICEX
VID
IOD
IIL
IOZH
IOZL
IOS
IZZ
ICCZ
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW Voltage
Input HIGH Current
10% VCC
10% VCC
5% VCC
5% VCC
10% VCC
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
2.0
2.5
2.4
2.7
2.7
4.75
60
V Recognized as a HIGH Signal
0.8 V
Recognized as a LOW Signal
1.2 V Min IIN = −18 mA
IOH = −1 mA
V Min IOH = −3 mA
IOH = −1 mA
IOH = −3 mA
0.5 V Min IOL = 24 mA
5.0 µA Max VIN = 2.7V
7.0 µA Max VIN = 7.0V
50 µA Max VOUT = VCC
V 0.0 IID = 1.9 µA
All Other Pins Grounded
3.75
µA
0.0 VIOD = 150 mV
All Other Pins Grounded
0.6 mA Max VIN = 0.5V
50 µA Max VOUT = 2.7V
50 µA Max VOUT = 0.5V
150 mA Max VOUT = 0V
500 µA 0.0V VOUT = 5.25V
63 85 mA Max VO = HIGH Z
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74F845SPC8-Bit Transparent LatchFairchild
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