Refer to the PDF data sheet for device specific package drawings
The SN74CB3Q16244 device is a high-bandwidth FET bus switch using a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The SN74CB3Q16244 device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q16244 device provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
SN74CB3Q16244DGG | TSSOP (48) | 12.50 mm × 6.10 mm |
SN74CB3Q16244DGV | TVSOP (48) | 9.70 mm × 4.40 mm |
SN74CB3Q16244DL | SSOP (48) | 15.88 mm × 7.49 mm |
Changes from A Revision (March 2005) to B Revision
The SN74CB3Q16244 device is organized as four 4-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or one 16-bit bus switch. When OE is low, the associated 4-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 4-bit bus switch is OFF, and a high-impedance state exists between the A and B ports.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging current backflow through the device when it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
1A1, 1A2 1A3, 1A4 |
47, 46 44, 43 |
I/O | Bidirectional signal to be switched |
1B1, 1B2 1B3, 1B4 |
2, 3 5, 6 |
I/O | Bidirectional signal to be switched |
1OE | 1 | I | Switch Output Enable to connect pins 1A1, 1A2, 1A3, 1A4 to 1B1, 1B2, 1B3, 1B4 (Active Low: L = ON, H = OFF) |
2A1, 2A2 2A3, 2A4 |
41, 40 38, 37 |
I/O | Bidirectional signal to be switched |
2B1, 2B2 2B3, 2B4 |
8, 9 11, 12 |
I/O | Bidirectional signal to be switched |
2OE | 48 | I | Switch Output Enable to connect pins 2A1, 2A2, 2A3, 2A4 to 2B1, 2B2, 2B3, 2B4 (Active Low: L = ON, H = OFF) |
3A1, 3A2 3A3, 3A4 |
36, 35 33, 32 |
I/O | Bidirectional signal to be switched |
3B1, 3B2 3B3, 3B4 |
13, 14 16, 17 |
I/O | Bidirectional signal to be switched |
3OE | 25 | I | Switch Output Enable to connect pins 3A1, 3A2, 3A3, 3A4 to 3B1, 3B2, 3B3, 3B4 (Active Low: L = ON, H = OFF) |
4A1, 4A2 4A3, 4A4 |
30, 29 27, 26 |
I/O | Bidirectional signal to be switched |
4B1, 4B2 4B3, 4B4 |
19, 20 22, 23 |
I/O | Bidirectional signal to be switched |
4OE | 24 | I | Switch Output Enable to connect pins 4A1, 4A2, 4A3, 4A4 to 4B1, 4B2, 4B3, 4B4 (Active Low: L = ON, H = OFF) |
VCC | 7, 18, 31, 42 | — | Power Supply |
GND | 4, 10, 15, 21 28, 34, 39, 45 |
— | Ground |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VCC | Supply voltage(2) | –0.5 | 4.6 | V | |
VIN | Control input voltage(2)(3) | –0.5 | 7 | V | |
VI/O | Switch I/O voltage(2)(3)(4) | –0.5 | 7 | V | |
IIK | Control input clamp current | VIN < 0 | –50 | mA | |
II/OK | I/O port clamp current | VI/O < 0 | –50 | mA | |
II/O | ON-state switch current(5) | ±64 | mA | ||
Continuous current through VCC or GND | ±100 | mA | |||
TJ | Junction temperature | 150 | °C | ||
Tstg | Storage temperature | –65 | 150 |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | +2000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | +1000 |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
VCC | Supply voltage | 2.3 | 3.6 | V | |
VIH | High-level control input voltage | VCC = 2.3 V to 2.7 V | 1.7 | 5.5 | V |
VCC = 2.7 V to 3.6 V | 2 | 5.5 | |||
VIL | Low-level control input voltage | VCC = 2.3 V to 2.7 V | 0 | 0.7 | V |
VCC = 2.7 V to 3.6 V | 0 | 0.8 | |||
VI/O | Data input/output voltage | 0 | 5.5 | V | |
TA | Operating free-air temperature | –40 | 85 | °C |
THERMAL METRIC(1) | SN74CB3Q16244 | UNIT | ||||
---|---|---|---|---|---|---|
DGG (TSSOP) | DGV (TVSOP) | DL (SSOP) | ||||
48 PINS | 48 PINS | 48 PINS | ||||
RθJA | Junction-to-ambient thermal resistance | 70 | 58 | 63 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP(2) | MAX | UNIT | |||
---|---|---|---|---|---|---|---|---|
VIK | VCC = 3.6 V, | II = –18 mA | –1.8 | V | ||||
IIN | Control inputs | VCC = 3.6 V, | VIN = 0 to 5.5 V | ±1 | µA | |||
IOZ(3) | VCC = 3.6 V, | VO = 0 to 5.5 V, VI = 0, |
Switch OFF, VIN = VCC or GND |
±1 | µA | |||
Ioff | VCC = 0, | VO = 0 to 5.5 V, | VI = 0 | 1 | µA | |||
ICC | VCC = 3.6 V, | II/O = 0, Switch ON or OFF, |
VIN = VCC or GND | 1 | 2 | mA | ||
ΔICC(4) | Control inputs | VCC = 3.6 V, | One input at 3 V, | Other inputs at VCC or GND | 30 | µA | ||
ICCD(5) | Per control input |
VCC = 3.6 V, | A and B ports open, Control input switching at 50% duty cycle |
0.15 | 0.25 | mA/ MHz |
||
Cin | Control inputs | VCC = 3.3 V, | VIN = 5.5 V, 3.3 V, or 0 | 3.5 | 5 | pF | ||
Cio(OFF) | VCC = 3.3 V, | Switch OFF, VIN = VCC or GND, |
VI/O = 5.5 V, 3.3 V, or 0 | 4 | 6 | pF | ||
Cio(ON) | VCC = 3.3 V, | Switch ON, VIN = VCC or GND, |
VI/O = 5.5 V, 3.3 V, or 0 | 10 | 13 | pF | ||
ron(6) | VCC = 2.3 V, TYP at VCC = 2.5 V |
VI = 0, | IO = 30 mA | 6 | 8 | Ω | ||
VI = 1.7 V, | IO = –15 mA | 5 | 10 | |||||
VCC = 3 V | VI = 0, | IO = 30 mA | 6 | 8 | ||||
VI = 2.4 V, | IO = –15 mA | 5 | 9 |
PARAMETER | FROM (INPUT) |
TO (OUTPUT) |
VCC = 2.5 V ± 0.2 V |
VCC = 3.3 V ± 0.3 V |
UNIT | ||
---|---|---|---|---|---|---|---|
MIN | MAX | MIN | MAX | ||||
fOE(1) | OE | A or B | 10 | 20 | MHz | ||
tpd(2) | A or B | B or A | 0.18 | 0.3 | ns | ||
ten | OE | A or B | 1.5 | 8 | 1.5 | 7 | ns |
tdis | OE | A or B | 1 | 8 | 1 | 7 | ns |