Maxim MAX3268CUB, MAX3268C-D, MAX3265EUE, MAX3265CUE, MAX3265CUB Datasheet

V

CC

V

CC

C

AZ

CAZ1 CAZ2

V

CC

V

CC

C

IN

0.01µF

0.01µF

0.01µF

C

IN

0.01µF

TH SQUELCH

N.C.

100Ω

IN-

IN+

OUT+

R

TERM

R

TERM

R

L

100Ω

OUT-

MAX3266
MAX3267

MAX3264CUE
MAX3265CUE
MAX3265EUE

LOS

LOSS

OF

SIGNAL

LOS

N.C.

R

TH

LEVEL

N.C.

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For small orders, phone [phone].

General Description

The 1.25Gbps MAX3264/MAX3268 and the 2.5Gbps
MAX3265/MAX3269 limiting amplifiers are designed for
Gigabit Ethernet and Fibre Channel optical receiver sys­tems. The amplifiers accept a wide range of input volt­ages and provide constant-level output voltages with
controlled edge speeds. Additional features include
RMS power detectors with programmable loss-of-signal
(LOS) indication, an optional squelch function that
mutes the data output signal when the input voltage falls
below a programmable threshold, and excellent jitter
performance.

The MAX3264/MAX3265 feature current-mode logic
(CML) data outputs that are tolerant of inductive con­nectors and a 16-pin TSSOP package, making these
circuits ideal for GBIC receivers. The MAX3268/
MAX3269 feature standards-compliant positive-refer­enced emitter-coupled logic (PECL) data outputs and
are available in a tiny 10-pin µMAX package that is
ideal for small-form-factor receivers.

Applications

Gigabit Ethernet Optical Receivers

Fibre Channel Optical Receivers

System Interconnect

ATM Optical Receivers

Features

♦ +3.0V to +5.5V Supply Voltage

♦ Low Deterministic Jitter

14ps (MAX3264)
11ps (MAX3265)

♦ 150ps max Edge Speed (MAX3265)

300ps max Edge Speed (MAX3264)

♦ Programmable Signal-Detect Function

♦ Choice of CML or PECL Output Interface

♦ 10-Pin µMAX or 16-Pin TSSOP Package

MAX3264/MAX3265/MAX3268/MAX3269

3.0V to 5.5V, 1.25Gbps/2.5Gbps
Limiting Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-1523; Rev 1; 1/00

PART

MAX3264CUE

MAX3264C/D 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 TSSOP-EP

†

Dice*

*Dice are designed to operate from 0°C to +70°C, but are tested

and guaranteed only at TA= +25°C.

†

EP = Exposed paddle

Ordering Information

MAX3265CUE

0°C to +70°C 16 TSSOP-EP

†

MAX3265C/D 0°C to +70°C Dice*

MAX3268CUB

MAX3268C/D

MAX3269CUB

0°C to +70°C 10 µMAX-EP

†

0°C to +70°C

0°C to +70°C Dice*

10 µMAX-EP

†

MAX3269C/D 0°C to +70°C Dice*

Selector Guide appears at end of data sheet.
Pin Configurations appear at end of data sheet.

Typical Operating Circuits

Typical Operating Circuits continued at end of data sheet.

MAX3265CUB 0°C to +70°C 10 µMAX-EP

†

MAX3265EUE -40°C to +85°C 16 TSSOP-EP

†

MAX3264/MAX3265/MAX3268/MAX3269

3.0V to 5.5V, 1.25Gbps/2.5Gbps
Limiting Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= 0°C to +70°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

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 in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Supply Voltage (VCC) ............................................-0.5V to +6.0V

Voltage at IN+, IN- ..........................(V

CC

- 2.4V) to (VCC+ 0.5V)

Voltage at SQUELCH, CAZ1,

CAZ2, LOS, LOS, TH..................................-0.5V to (V

CC

+ 0.5V)

Voltage at LEVEL...................................................-0.5V to +2.0V

Current into LOS, LOS ..........................................-1mA to +9mA

Differential Input Voltage (IN+ - IN-) .....................................2.5V

Continuous Current at

CML Outputs (OUT+, OUT-) ..........................-25mA to +25mA

Continuous Current at PECL Outputs (OUT+, OUT-) .........50mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 27mW/°C above +70°C) .........2162mW

10-Pin µMAX (derate 20mW/°C above +70°C) ...........1600mW

Operating Ambient Temperature Range .............-40°C to +85°C

Storage Temperature Range .............................-55°C to +150°C

Processing Temperature (dice) .......................................+400°C

Lead Temperature (soldering, 10s) .................................+300°C

Deterministic Jitter

MAX3265/MAX3269 (Notes 2, 3)

MAX3265/MAX3269

MAX3264/MAX3268

MAX3265/MAX3269

MAX3264/MAX3268

4.5 6.9

8.5 12.2

Low LOS Deassert Level mVRTH= 2.5kΩ

MAX3264/MAX3268 (Notes 2, 3)

PARAMETER MIN TYP MAX UNITS

10 1200

5 1200

Data Rate Gbps

Input Voltage Range mV

14 30

11 25

1.25

2.5

ps

p-p

15

Random Jitter

8

ps

RMS

80 175 300

100 150

80 150 300

Data Output Edge Speed

100 150

ps

LOS Hysteresis 2.5 4.4 dB

LOS Assert/Deassert Time 1 µs

1.20 2.6

2.20 4.8

Low LOS Assert Level mV

CONDITIONS

MAX3264/MAX3268 (Notes 2, 4)

MAX3265/MAX3269

MAX3264/MAX3268

MAX3265/MAX3269 (Notes 2, 4)

MAX3264 (Note 5)

MAX3265 (Note 6)

MAX3268 (Note 5)

MAX3269 (Note 6)

MAX3264/MAX3268

(Notes 2, 7)

MAX3265/MAX3269

(Notes 7, 8)

RTH= 2.5kΩ

MAX3264/MAX3265/MAX3268/MAX3269

3.0V to 5.5V, 1.25Gbps/2.5Gbps
Limiting Amplifiers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= 0°C to +70°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

High LOS Assert Level RTH= 20kΩ

PARAMETER MIN TYP MAX UNITS

27 35.0

15 19.8

Medium LOS Assert Level mV

Medium LOS Deassert Level mV

9.4 21.6

18.0 41.5

5.6 9

9.9 1.6

mV

080400Squelch Input Current µA

PECL Output High Voltage -1.025 -0.880 V

PECL Output Low Voltage -1-810 1.620 V

CONDITIONS

RTH= 7kΩ

RTH= 7kΩ

Referenced to V

CC

Referenced to V

CC

MAX3264/MAX3268

MAX3265/MAX3269

MAX3264/MAX3268

MAX3265/MAX3269

MAX3264/MAX3268

MAX3265/MAX3269

High LOS Deassert Level RTH= 20kΩ

35 53.0

67 101

mV

MAX3264/MAX3268

MAX3265/MAX3269

97 100 103Differential Input Resistance ΩIN+ to IN-

150

Input-Referred Noise µV

RMS

MAX3264/MAX3268

230MAX3265/MAX3269

550 1200

CML Output Voltage mV

LEVEL = open, R

LOAD

= 50Ω

1100 1270 1800LEVEL = GND and R

LOAD

= 75Ω

LOS Output High Voltage 2.4 V

LOS Output Low Voltage 0.4 V

I

LOS

= -30µA

I

LOS

= +1.2mA

Output Signal When Squelched 20 mV

Power-Supply Rejection Ratio 20 dB

Outputs AC-coupled

f < 2MHz

Low-Frequency Cutoff

2 MHz

2 kHz

CAZ= open

CAZ= 0.1µF

Output Resistance (single ended)

85 100 115

Ω

4

MAX3264/MAX3265

MAX3268/MAX3269

Power-Supply Current

38 62

mA

50 76

Figure 2

39 62

48 78MAX3269

MAX3268

MAX3265

MAX3264

mV

V

V

mV

MAX3264/MAX3265/MAX3268/MAX3269

3.0V to 5.5V, 1.25Gbps/2.5Gbps
Limiting Amplifiers

4 _______________________________________________________________________________________

Note 1: Specifications for Input Voltage Range, LOS Assert/Deassert Levels, and CML Output Voltage refer to the total differential

peak-to-peak signal applied or measured. PECL output voltages are absolute (single-ended) voltages measured at a single
output.

Note 2: Input edge speed is controlled using 4-pole, lowpass Bessel filters with bandwidth approximately 75% of the maximum

data rate.

Note 3: Deterministic jitter is measured with a K28.5 pattern (0011 1110 1011 0000 0101). Deterministic jitter is the peak-to-peak

deviation from ideal time crossings, measured at the zero-level crossings of the differential output per ANSI X3.230,
Annex A.

Note 4: Random jitter is measured with the minimum input signal applied after filtering with a 4-pole, lowpass, Bessel filter (frequen-

cy bandwidth at 75% of the maximum data rate). For Fibre Channel and Gigabit Ethernet applications, the peak-to-peak
random jitter is 14.1-times the RMS random jitter.

Note 5: Input signal applied after a 933MHz Bessel filter.
Note 6: Input signal applied after a 1.8GHz Bessel filter.
Note 7: Input for LOS assert/deassert and hysteresis tests is a repeating K28.5 pattern. Hysteresis is defined as:

20log (V

LOS-DEASSERT

/ V

LOS-ASSERT

).

Note 8: Response time to a 10dB change in input power.

ELECTRICAL CHARACTERISTICS—MAX3265EUE

(Data outputs terminated per Figure 1, VCC= +3.0V to +5.5V, TA= -40°C to +85°C. Typical values are at V

CC

= +3.3V, TA= +25°C,

unless otherwise noted.) (Note 1)

CONDITIONS

Data Rate Gbps

2.5

UNITSMIN TYP MAXPARAMETER

Input Voltage Range mV

10 1200

(Notes 2, 3)Deterministic Jitter ps

p-p

11 25

(Notes 2, 4)Random Jitter ps

RMS

8

(Note 6)Data Output Edge Speed ps

100 155

(Notes 2, 7)LOS Hysteresis dB

2.2 4.4

(Notes 7, 8)LOS Assert/Deassert Time µs

1

Output Resistance (single ended) Ω

85 100 115

CAZ= 0.1µF kHz

2

CAZ= open

Low-Frequency Cutoff

MHz

2

f < 2MHzPower-Supply Rejection Ratio dB

20

Outputs AC-coupledOutput Signal When Squelched

20

I

LOS

= +1.2mALOS Output Low Voltage

0.450

I

LOS

= -30µALOS Output High Voltage

LEVEL = GND, R

LOAD

= 75Ω

1100 1270 1800

LEVEL = open, R

LOAD

= 50Ω

CML Output Voltage

550 1200

Input-Referred Noise

µV

RMS

230

IN+ to IN-Differential Input Resistance

Ω

97 100 103

Squelch Input Current

µA

0 80 400

RTH= 20kΩHigh LOS Deassert Level mV

67 111

RTH= 20kΩHigh LOS Assert Level mV

18.0 41.5

RTH= 7kΩMedium LOS Deassert Level mV

27 43.0

RTH= 7kΩMedium LOS Assert Level mV

9.9 16

RTH= 2.5kΩLow LOS Deassert Level mV

8.5 13.6

RTH= 2.5kΩLow LOS Assert Level mV

2.20 4.8

Figure 2Power-Supply Current mA

50 76

2.4

MAX3264/MAX3265/MAX3268/MAX3269

3.0V to 5.5V, 1.25Gbps/2.5Gbps
Limiting Amplifiers

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

3.5

4.0

6.5

6.0

5.5

5.0

4.5

-40 -15 10 35 60 85

MAX3265EUE

LOS HYSTERESIS vs. TEMPERATURE

MAX3264/5/8/9 TOC03

TEMPERATURE (°C)

LOS HYSTERESIS (dB)

RTH = 4.6kΩ

RTH = 16kΩ

1700

1500

1300

1100

900

OUTPUT VOLTAGE (mV)

700

500

300

024681012

30

25

20

15

JITTER (ps)

10

5

0

0 200 400 600 800 1000 1200

8

7

6

5

4

3

RMS JITTER (ps)

2

1

0

0 1020304050

OUTPUT VOLTAGE

vs. INPUT VOLTAGE

MAX3264/MAX3268

MAX3264/5/8/9 TOC01a

MAX3265/MAX3269

INPUT VOLTAGE (mV)

LOS HYSTERESIS vs. TEMPERATURE

6.5

6.0

5.5

5.0

4.5

LOS HYSTERESIS (dB)

RTH = 25kΩ

4.0

3.5
0 10203040506070

MAX3264/MAX3268

DETERMINISTIC JITTER

vs. INPUT AMPLITUDE

16

14

12

MAX3264/5/8/9 TOC04

10

8

6

RMS JITTER (ps)

4

2

0

INPUT AMPLITUDE (mV)

0 1020304050

MAX3265/MAX3269

RANDOM JITTER

vs. INPUT AMPLITUDE

MAX3264/5/8/9 TOC07

INPUT AMPLITUDE (mV)

LOSS OF SIGNAL WITH SQUELCH

V

IN

V

OUT

V

LOS

MAX3264

RTH = 7kΩ

TEMPERATURE (°C)

MAX3264/MAX3268

RANDOM JITTER

vs. INPUT AMPLITUDE

INPUT AMPLITUDE (mV)

500ns/div

MAX3264/5/8/9 TOC03a

MAX3264/5/8/9 TOC05

JITTER (ps)

MAX3264/5/8/9 TOC08

300mV/div

MAX3265/MAX3269

DETERMINISTIC JITTER

vs. INPUT AMPLITUDE

30

25

20

15

10

5

0

0 200 400 600 800 1000 1200

INPUT AMPLITUDE (mV)

MAX3268

DATA OUTPUT EYE DIAGRAM

(MINIMUM INPUT)

200ps/div

MAX3264/5/8/9 TOC06

MAX3264/5/8/9 TOC09