Datasheet SN74TVC16222ADGGR, SN74TVC16222ADGVR, SN74TVC16222ADL, SN74TVC16222ADLR Datasheet (Texas Instruments)

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SN74TVC16222A

22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

Designed to Be Used in Voltage-Limiting Applications

6.5-Ω On-State Connection Between Ports A and B

Flow-Through Pinout for Ease of Printed Circuit Board Trace Routing

Direct Interface With GTL+ Levels

ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101)

Package Options Include Plastic 300-mil Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), and Thin Very Small-Outline (DGV) Packages

description

The SN74TVC16222A provides 23 parallel NMOS pass transistors with a common gate. The low on-state resistance of the switch allows connections to be made with minimal propagation delay .

The device can be used as a 22-bit switch with the gates cascaded together to a reference transistor. The low-voltage side of each pass transistor is limited to a voltage set by the reference transistor. This is done to protect components with inputs that are sensitive to high-state voltage-level overshoots. (See data sheet.)

Application Information

in this

DGG, DGV, OR DL PACKAGE

GND

A1 A2 A3 A4 A5 A6 A7 A8 A9

A10

A11 A12 A13 A14 A15 A16 A17 A18 A19 A20 A21 A22 A23

(TOP VIEW)

GATE B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19 B20 B21 B22 B23

All of the transistors in the TVC array have the same electrical characteristics; therefore, any one of them can be used as the reference transistor. Because, within the device, the characteristics from transistor-to-transistor are equal, the maximum output high-state voltage (VOH) is approximately the reference voltage (V minimum deviation from one output to another. This is a benefit of the TVC solution over discrete devices. Because the fabrication of the transistors is symmetrical, either port connection of each bit can be used as the low-voltage side, and the I/O signals are bidirectional through each FET.

The SN74TVC16222A is characterized for operation from –40°C to 85°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TI is a trademark of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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REF

), with

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SN74TVC16222A 22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

simplified schematic

GATE B1 B2 B3 B4 B23

48 47 46 45 44 25

12 3 4 5 24

GND A1 A2 A3 A4 A23

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Input voltage range, V Input/output voltage range, V

(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O

†

Continuous channel current 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, I Package thermal impedance, θ

< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Note 2): DGG package 70°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DGV package 58°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DL package 63°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. The input and input/output negative-voltage ratings may be exceeded if the input and input/output clamp-current ratings are

observed.

2. The package thermal impedance is calculated in accordance with JESD 51.

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

recommended operating conditions

MIN TYP MAX UNIT

I/O

GATE

PASS

Input/output voltage 0 5 V GATE voltage 0 5 V Pass-transistor current 20 64 mA Operating free-air temperature –40 85 °C

application operating conditions (see Figure 2)

MIN TYP MAX UNIT

BIAS

REF

DPU

PASS

REF

BIAS voltage 3 3.3 3.6 V Reference voltage 1.365 1.5 1.635 V Drain pullup voltage 2.36 2.5 2.64 V Pass-transistor current 14 mA Reference-transistor current 5 µA Operating free-air temperature –40 85 °C

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A or B

B or A

SN74TVC16222A

22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT

i(GATE)

io(OFF)

io(ON)

‡

†

All typical values are at TA = 25°C.

‡

Measured by the voltage drop between the A and B terminals at the indicated current through the switch. On-state resistance is determined by the lower voltage of the two (A or B) terminals.

switching characteristics over recommended operating free-air temperature range, V

= 2.36 V to 2.64 V (unless otherwise noted) (see Figure 1)

DPU

PARAMETER

PLH

PHL

= 0, II = –18 mA –1.2 V

BIAS

= 5 mA,

REF

= 2.625 V,

DPU

VI = 3 V or 0 73 pF VO = 3 V or 0 4 12 pF VO = 3 V or 0 12 25 pF I

= 5 mA,

REF

= 2.625 V,

DPU

REF

DPU

REF

DPU

FROM

(INPUT)

= 1.365 V,

= 150 Ω,

= 1.365 V,

= 150 Ω,

VS = 0.175 V, (see Figure 2)

(OUTPUT)

350 mV

12.5 Ω

MIN MAX UNIT

0 4 0 4

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SN74TVC16222A 22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

PARAMETER MEASUREMENT INFORMATION

Motherboard

Interface

GATE 48

TVC16222A

3.3 V

200 kΩ

B1 (V 47

2 A1 (V

Open-Drain

Test Interface

BIAS

REF

DPU

150 Ω

)

B2 46

3 A2 (VS)

TESTER CALIBRATION SETUP (see Note C)

DPU

150 Ω

B3 45

4 A3 (VS)

DPU

150 Ω

B4 44

5 A4 (VS)

DPU

150 Ω

B23 25

24 A23 (VS)

Input

GATE

Tester

PLHREF

Output

Reference

PLHDUT

Output Device

Under Test

(see Note D)

NOTES: A. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2 ns, tf ≤ 2 ns.

B. The outputs are measured one at a time with one transition per measurement. C. Test procedure: t

D. t E. t

PLHDUT PLH PHL

= t

PLHDUT

= t

PHLDUT

and t

PLHREF

PHLDUT

and t

are obtained by measuring the propagation delay of the device under test.

– t

PLHREF

– t

PHLREF

1.25 V 1.25 V

PLH

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

PHLREF

are obtained by measuring the propagation delay of a reference measuring point.

PHLREF

1.25 V 1.25 V

2.5 V

0 V

2.5 V

PHLDUT

2.5 V

PHL

(see Note E)

Figure 1. Tester Calibration Setup and Voltage Waveforms

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SN74TVC16222A

22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

TVC background information

In personal computer (PC) architecture there are industry-accepted bus standards. These standards define, among other things, the I/O voltage levels at which the bus communicates. Examples include the GTL+ host bus, the AGP graphics port, and the PCI local bus. In new designs, the system components must communicate with existing bus infrastructure. Providing an evolutionary upgrade path is important in the design of PC architecture, but the existing bus standards must be preserved.

To achieve the ever-present needs for smaller, faster, lighter devices that draw less power, yet have faster performance, most new high-performance digital integrated circuits are designed and produced with advanced submicron semiconductor process technologies. These devices have thin gate-oxide or short channel lengths and very low absolute-maximum voltages that can be tolerated at the inputs/outputs (I/Os) without causing damage. In many cases, the I/Os of these devices are not tolerant of the high-state voltage levels on the pre-existing buses with which they must communicate. Therefore, the need exists for protection of the I/Os of devices by limiting the I/O voltages.

The Texas Instruments (TI) translation voltage clamp (TVC) family is designed for the specific application of protecting sensitive I/Os (see Figure 2). The information in this data sheet describes the I/O protection application of the TVC family and should enable the design engineer to successfully implement an I/O protection circuit utilizing the TI TVC solution.

Low-Voltage

I/O Device

Figure 2. Thin Gate-Oxide Protection Application

TVC Family

Voltage-Clamp

Device

Standard-Voltage

I/O Bus

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SN74TVC16222A 22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

TVC voltage-limiting application

For the voltage-limiting configuration, the common GA TE input must be connected to one side (A or B) of any one of the transistors (see Figure 3). This connection determines the V V

input is connected through a pullup resistor (typically 200 kΩ ) to the VDD supply. A filter capacitor on V

BIAS

is recommended. The opposite side of the reference transistor is used as the reference voltage (V connection. The V

input must be less than V

REF

– 1 V to bias the reference transistor into conduction. The

reference transistor regulates the gate voltage (VG) of all the pass transistors. VG is determined by the characteristic gate-to-source voltage difference (VGS) because V

pass transistors has a high-level voltage limited to a maximum of V

3.3 V

Motherboard

Interface

GATE 48

200 kΩ

150 Ω 150 Ω 150 Ω 150 Ω

†

B1 (V 47

BIAS

†

)

46 45 44 25

input of the reference transistor. The

BIAS

= V

+ VGS. The low-voltage side of the

REF

– VGS, or V

REF

2.5 V

BIAS

REF

)

TVC16222A

CPU Interface

†

REF

and V

can be applied to any one of the pass transistors. GATE must be connected externally to V

BIAS

2 A1 (V

Open-Drain

REF

†

)

345 24

BIAS

Figure 3. Typical Application Circuit

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SN74TVC16222A

22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

electrical characteristics

The electrical characteristics of the NMOS transistors used in the TVC devices are illustrated by TI SPICE simulations. Figure 4 shows the test configuration for the TI SPICE simulations. The results, shown in Figures 5 and 6, show the current through a pass transistor versus the voltage at the source for different reference voltages. The plots of the dc characteristics clearly reveal that the device clamps at the desired reference voltage for the varying device environments.

Figure 5 shows the V-I characteristics with low reference voltages and a reference-transistor drain-supply voltage of 3.3 V . To further investigate the spread of the V-I characteristic curves, V I

was increased by raising V

REF

DDREF

(see Figure 6). The result was a tighter grouping of the V-I curves.

was held at 2.5 V and

REF

DDREF

GATE V

DREF

BIAS

REF

DDPASS

DPASS

SPASS

Figure 4. TI SPICE-Simulation Schematic and Voltage-Node Names

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SN74TVC16222A 22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

–2 –4 –6

–8 –10 –12 –14

– Pass Current – mA

–16

PASS

I– Pass Current – mA

–18 –20

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2

–2

–4

–6

–8 –10 –12 –14 –16

PASS

I– Pass Current – mA

–18 –20

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2

APPLICATION INFORMATION

– Low Reference Voltage – V

SPASS

– Low Reference Voltage – V

SPASS

REF

DDREF

DREF

DPASS

DDPASS

REF

DDREF

DREF

DPASS

DDPASS

= 1 V

= 3.3 V

= 200 kΩ

= 150 Ω

= 3.3 V

Weak Nominal Strong

= 1.5 V

= 3.3 V

= 200 kΩ

= 150 Ω

= 3.3 V

Weak Nominal Strong

PASS

–2

–4

–6

–8 –10 –12 –14 –16 –18 –20

0.4 0.8 1.2 1.6 2.0 2.4 2.8 V

Figure 5. V-I Electrical Characteristics at Low V

– Low Reference Voltage – V

SPASS

REF

DDREF

DREF

DPASS

DDPASS

Voltages

= 2 V

= 3.3 V

= 200 kΩ

= 150 Ω

= 3.3 V

Weak Nominal Strong

3.2

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SN74TVC16222A

22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

= 2.5 V

–2 –4 –6

–8 –10 –12

– Pass Current – mA

–14 –16

PASS

I– Pass Current – mA

–18 –20

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2

–2 –4 –6

–8 –10 –12 –14 –16

PASS

I– Pass Current – mA

–18 –20

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2

SPASS

– Low Reference Voltage – V

REF

DDREF

DREF

DPASS

DDPASS

REF

DDREF

DREF

DPASS

DDPASS

= 3.3 V

= 200 kΩ

= 150 Ω

= 3.3 V

Weak Nominal Strong

= 2.5 V

= 4 V

= 200 kΩ

= 150 Ω

= 3.3 V

Weak Nominal Strong

PASS

–2 –4 –6

–8 –10 –12 –14 –16 –18 –20

= 2.5 V

REF

V R R V

0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 V

Figure 6. V-I Electrical Characteristics at V

– Low Reference Voltage – V

SPASS

REF

= 2.5 V

DDREF

= 200 kΩ

DREF DPASS DDPASS

= 5 V

= 150 Ω

= 3.3 V

Weak Nominal Strong

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SN74TVC16222A 22-BIT VOLTAGE CLAMP

SCDS087B – APRIL 1999 – REVISED NOVEMBER 1999

APPLICATION INFORMATION

features and benefits

The TVC family has several features that benefit a system designer when implementing a sensitive I/O protection solution. Table 1 lists these features and their associated benefits.

Table 1. Features and Benefits

FEATURES BENEFITS

Any FET can be used as the reference transistor Ease of layout All FETs on one die, tight process control Very low spread of VO relative to V No active control logic (passive device) No logic power supply (VCC) required Flow-through pinout Ease of trace routing Devices offered in different bit widths and packages Optimizes design and cost effectiveness Designer flexibility with V

input Allows migration to lower-voltage I/Os without board redesign

REF

conclusion

The TI TVC family provides the designer with a solution for protection of circuits with I/Os that are sensitive to high-state voltage-level overshoots. The flexibility of TVC enables a low-voltage migration path for advanced designs to align with industry standards.

REF

frequently asked questions (FAQs)

1. Q: Can any of the transistors in the array be used as the reference transistor? A: Yes, any transistor can be used as long as its V

2. Q: In the

Should V

A: V

BIAS

bias voltage to be controlled by V than V

recommended operating conditions

be equal to or greater than V

BIAS

is a variable that is determined by V

. VDD can be as high as 5.5 V . V

on the reference transistor.

BIAS

REF

table of the data sheet, the typical V

REF

. V

REF

3. Q: Do both A and B ports have 5-V I/O tolerance or is 5-V I/O tolerance provided only on the low-voltage

side?

A: Both ports are 5-V tolerant.

pin is connected to the GATE pin.

BIAS

on the reference transistor?

is connected to VDD through a resistor to allow the

BIAS

needs to be at least 1 V less

REF

is 3.3 V.

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