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Part Numbert Mfg Packt D/C Descriptiont Qty Company/Contact  
N74LS21N SIG    82  new original parts ,  46 

N74LS21N Datasheet

Pin No. Pin name Function
1 OPOUT Operational amplifier output
2 BIAS Bias pin
3 DRIN' Driver gain adjustment
4 DRIN Driver gain input
5 NC N.C (not connected internally)
6 NC N.C (not connected internally)
7 DROUT- Driver negative (relative to input) output
8 DROUT+ Driver positive (relative to input) output
9 NC. N.C. (not connected internally)
10 NC. N.C. (not connected internally)
11 Vcc Vcc
12 GND Substrate ground
13 GND Substrate ground
14 MUTE Mute
15 OPIN+ Operational amplifier noninverting input
16 OPIN- Operational amplifier inverting input


N74LS21N Price

j 3j
<I IL L 1.27 kj
2 54


N74LS21N on stock

INTERNAL RAM 512 WORDS LOADED FROM EXTERNAL BOOT MEMORY
RESERVED 1.5K
EXTERNAL 14K


Pin Name Descrlption
1 2 3 4 VGA IN l+ VGA IN l- VGA IN Q+ VGA IN Q- nputs for variable-gain amplifier.
5 6 7 8 BL l- BL l+ BL Q- BL Q+ Blocking caps for second variable-gain stage.
9 10 11 12 SR l+ SR l- SR Q+ SR Q- Bypass caps for variable-gain DC servo.
13 VCC1 Power Supply for variable-gain amplifier.
14 GND1 Ground for variable-gain amplifier.
15 16 17 18 VGA OUTI- VGA OUTI+ VGA OUT Q- VGA OUT Q+ Outputs far variabla-gain amplifier.
19 ENA VGA Enable variable-gain amplifier.
20 GND2 LNA Ground #1.
21 ATTN LNA Attenuation Pin. (1 = Low Gain, 0 = High Gain)
22 GND3 LNA Ground #2.
23 ENA RX Enable receiver front-end (LNA/Mixer).
24 GND4 LNA Ground #3.
25 LNA IN LNA Input. (Matching circuit required)
26 NC Not Connected.
27 GND5 Ground.
28 GND6 LNA substrate. Connected to GND.
29 VCC2 LNA Supply.
30 VCC3 Supply for bias circuitry.
31 GND7 Ground for bias circuitry.
32 VCC4 Mixer Reference. Connected to Vcc.
33 GND8 Mixer ground.
34 MIX BYP Mixer bias bypass. AC-coupled to ground.
35 36 MIX OUT Q+ MIX OUT Q- Mixer Quadrature Outputs.
37 vcc5 Mixer Output Vcc.
38 39 MIX OUT l+ MIX OUT l- Mixer In-phase outputs.
40 VCC6 LO Driver Vcc.
41 GND9 LO Dnver ground.
42 43 LO+ LO- Local Oscillator Inputs.
44 VCC7 LO Input Buffer Vcc.
45 GND10 LO Input Buffer Ground.
46 ENA BUF Enable LO Input Buffer.
47 GC REF VGA Gain Control Reference. AC-coupled to ground.
48 GC VGA Gain Control Pin.


 
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