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CBT3251D
1-of-8 FET multiplexer/demultiplexer
1. General descriptionThe CBT3251 is a 1-of-8 high-speed TTL-compatible FET multiplexer/demultiplexer. The
low ON-resistance of the switch allows inputs to be connected to outputs without adding
propagation delay or generating additional ground bounce noise.
When output enable (OE) is LOW, the CBT3251 is enabled. S0, S1 and S2 select one of
the Bn outputs for the A input data.
The CBT3251 is characterized for operation from 40 C to +85 C.
2. Features and benefits5 switch connection between two ports TTL-compatible input levels Minimal propagation delay through the switch Latch-up protection exceeds 100 mA per JEDEC standard JESD78 class II level A ESD protection: HBM JESD22-A114E exceeds 2000V MM JESD22-A115-A exceeds 200V CDM JESD22-C101C exceeds 1000V Multiple package options Specified from 40 Cto+85C
3. Ordering information[1] Also known as QSOP16.
CBT3251
1-of-8 FET multiplexer/demultiplexer
Rev. 2 — 16 September 2013 Product data sheet
Table 1. Ordering informationCBT3251D 40 Cto+85C SO16 plastic small outline package; 16 leads;
body width 3.9 mm
SOT109-1
CBT3251DB 40 Cto+85C SSOP16 plastic shrink small outline package; 16 leads;
body width 5.3 mm
SOT338-1
CBT3251DS 40 Cto+85C SSOP16[1] plastic shrink small outline package; 16 leads;
body width 3.9 mm; lead pitch 0.635 mm
SOT519-1
CBT3251PW 40 Cto+85C TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
4. Functional diagramNXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
5. Pinning information
5.1 Pinning
5.2 Pin description
Table 2. Pin descriptionB1, B2, B3, B4, B5, B6, B7, B8 1, 2, 3, 4, 12, 13, 14, 15 B outputs/inputs 5 A input/output
n.c. 6 not connected 7 output enable (active LOW)
S2, S1, S0 9, 10, 11 select control input
GND 8 ground (0V)
VCC 16 positive supply voltage
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
6. Functional description
7. Limiting values[1] The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[3] For SSOP16 and TSSOP16 package: Ptot derates linearly with 5.5 mW/K above 70 C.
8. Recommended operating conditions
Table 3. Function selection= HIGH voltage level; L= LOW voltage level; X= Don’t care. L L L A to B1 L L H A to B2 L H L A to B3 L H H A to B4 H L L A to B5 H L H A to B6 H H L A to B7 H H H A to B8 X X X switch off
Table 4. Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).
VCC supply voltage 0.5 +7.0 V input voltage [1] 0.5 +7.0 V
ISW switch current continuous current through each switch - 128 mA
IIK input clamping current VI <0V 50 mA
Tstg storage temperature 65 +150 C
Ptot total power dissipation Tamb = 40 C to +85 C
SO16 package [2] -500 mW
SSOP16 package [3] -500 mW
TSSOP16 package [3] -500 mW
Table 5. Operating conditionsAll unused control inputs of the device must be held at VCC or GND to ensure proper device operation.
VCC supply voltage 4.5 5.5 V
VIH HIGH-level input voltage 2.0 - V
VIL LOW-level input voltage - 0.8 V
Tamb ambient temperature operating in free-air 40 +85 C
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
9. Static characteristics[1] Typical value is measured at VCC =5V; Tamb =25C.
[2] Typical value is measured at VCC =4V; Tamb =25C.
[3] This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND.
[4] Measured by the voltage drop between the A and the Bn terminals at the indicated current through the switch. The lowest voltage of the
two (A or Bn) terminals determines the ON resistance.
10. Dynamic characteristics[1] This parameter is warranted but not production tested. The propagation delay is based on the RC time constant of the typical ON
resistance of the switch and a load capacitance, when driven by an ideal voltage source (zero output impedance).
[2] tPLH and tPHL are the same as tpd.
tPZL and tPZH are the same as ten.
tPLZ and tPHZ are the same as tdis.
Table 6. Static characteristicsTamb= 40 Cto+85 C.
VIK input clamping voltage VCC =4.5 V; II= 18 mA - - 1.2 V
Vpass pass voltage VI =VCC= 5.0 V; IO= 100A [1] 3.6 3.9 4.2 V input leakage current VCC =5.5 V; VI= GND or 5.5V - - 1 A
ICC supply current VCC =5.5 V; IO =0mA; =VCCor GND 3 A
ICC additional supply current per input; VCC= 5.5 V; one input at
3.4 V, other inputs at VCC or GND
[3] -- 2.5 mA input capacitance control pins; VI =3V or 0V [1] -3.5 -pF
Cio(off) off-state input/output capacitance A port; VO=3 V or 0 V; OE =VCC [1]- 17.5 - pF
B port; VO=3 V or 0 V; OE =VCC [1] -4.0 -pF
RON ON resistance VCC =4V [4]= 2.4 V; II =15mA [2] -5 20
VCC =4.5V [4] =0V; II =64mA [1] -5 7 =0V; II =30mA [1] -5 7 = 2.4 V; II =15mA [1] -10 15
Table 7. Dynamic characteristicsTamb= 40 Cto+85 C; VCC= 4.5 V to 5.5 V; for test circuit, see Figure6.
tpd propagation delay A to Bn or Bn to A; see Figure4 [1][2] -0.25 ns
Sn to A; see Figure4 [1][2] 1.5 5.5 ns
ten enable time OE to A or Bn; see Figure5 [2] 1.5 5.6 ns
Sn to Bn; see Figure5 [2] 1.6 5.8 ns
tdis disable time OE to A or Bn; see Figure5 [2] 1.9 6.4 ns
Sn to Bn; see Figure5 [2] 2.3 6.2 ns
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
11. AC waveforms
Table 8. Measurement points4.5 V to 5.5 V GND to 3.0 V 1.5 V 1.5 V VOL + 0.3 V VOH 0.3 V
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
12. Test information
Table 9. Test data4.5 V to 5.5 V GND to 3.0 V 2.5 ns 50 pF 500 open 7.0 V open
NXP Semiconductors CBT3251
1-of-8 FET multiplexer/demultiplexer
13. Package outline
