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參數(shù)資料
| 型號： | SN74LS148NE4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | LS SERIES, 8-BIT ENCODER, INVERTED OUTPUT, PDIP16 |
| 封裝： | ROHS COMPLIANT, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大小： | 831K |
| 代理商： | SN74LS148NE4 |
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SN54147, SN54148, SN54LS147, SN54LS148
SN74147, SN74148 (TIM9907), SN74LS147, SN74LS148
10LINE TO 4LINE AND 8LINE TO 3LINE PRIORITY ENCODERS
SDLS053B OCTOBER 1976 REVISED MAY 2004
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SERIES 54LS/74LS DEVICES
tPHL
tPLH
tPHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
High-Level
Pulse
Low-Level
Pulse
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note D)
3 V
0 V
VOL
VOH
VOL
In-Phase
Output
(see Note D)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VCC
RL
Test
Point
From Output
Under Test
CL
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT
FOR 2-STATE TOTEM-POLE OUTPUTS
(see Note B)
VCC
RL
From Output
Under Test
CL
(see Note A)
Test
Point
(see Note B)
VCC
RL
From Output
Under Test
CL
(see Note A)
Test
Point
5 k
NOTES: A. CL includes probe and jig capacitance.
B. All diodes are 1N3064 or equivalent.
C. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control.
D. S1 and S2 are closed for tPLH, tPHL, tPHZ, and tPLZ; S1 is open, and S2 is closed for tPZH; S1 is closed, and S2 is open for tPZL.
E. Phase relationships between inputs and outputs have been chosen arbitrarily for these examples.
F. All input pulses are supplied by generators having the following characteristics: PRR
≤ 1 MHz, ZO ≈ 50 , tr ≤ 1.5 ns, tf ≤ 2.6 ns.
G. The outputs are measured one at a time, with one input transition per measurement.
S1
S2
tPHZ
tPLZ
tPZL
tPZH
3 V
0 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
3 V
0 V
Output
Control
(low-level
enabling)
Waveform 1
(see Notes C
and D)
Waveform 2
(see Notes C
and D)
≈1.5 V
VOH 0.5 V
VOL + 0.5 V
≈1.5 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
1.3 V
tw
1.3 V
VOL
VOH
Figure 2. Load Circuits and Voltage Waveforms
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74LS148NMOT88 | 制造商:Motorola 功能描述:74LS148N SB-12 |
| SN74LS148NS | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| SN74LS148NSR | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8-line to 3-line Priority encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148NSRE4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8-line to 3-line Priority encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SN74LS148NSRG4 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 8 Ln to 3 Ln Priority Encoder RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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