MAX3680EAI+T Maxim Integrated Products, MAX3680EAI+T Datasheet - Page 7

• Manufacturer Part Number: MAX3680EAI+T
• Description: IC DESERIALZR 622MBPS TTL 28SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX3680EAI+T

• Function: Deserializer
• Data Rate: 622Mbps
• Input Type: PECL
• Output Type: TTL
• Number Of Inputs: 1
• Number Of Outputs: 8
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The serial data and clock PECL inputs (SD+, SD-,
SCLK+, SCLK-) require 50Ω termination to (V
when interfacing with a PECL source (see Alternative
PECL Input Termination ).
Figure 4 shows alternative PECL input-termination
methods. Use Thevenin-equivalent termination when a
(V
coupling is necessary, such as when interfacing with
an ECL-output device, use the ECL AC-coupling termi-
nation.
For best performance, use good high-frequency layout
techniques. Filter voltage supplies and keep ground
connections short. Use multiple vias where possible.
Also, use controlled impedance transmission lines to
interface with the MAX3680 data inputs.
CC
TOP VIEW
() MAX3680A ONLY.
- 2V) termination voltage is not available. If AC
Alternative PECL Input Termination
SCLK+
SCLK-
(N.C.)
SYNC
(N.C.)
PCLK
GND
GND
GND
SD+
V
V
SD-
V
V
V
Applications Information
CC
CC
CC
CC
CC
_______________________________________________________________________________________
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX3680A
MAX3680/
SSOP
Pin Configuration
Layout Techniques
1:8 Deserializer with TTL Outputs
25
24
23
19
18
17
16
15
28
27
26
22
21
20
PD7
GND
PD6
V
PD5
PD4
PD3
GND
PD2
V
PD1
GND
PD0
GND
CC
CC
PECL Inputs
+3.3V, 622Mbps, SDH/SONET
CC
- 2V)
TRANSISTOR COUNT: 1346
Figure 4. Alternative PECL Input Termination
Z
Z
O
O
= 50Ω
= 50Ω
+3.3V
+3.3V
Z
Z
O
O
= 50Ω
= 50Ω
-2V
-2V
THEVENIN-EQUIVALENT TERMINATION
ECL AC-COUPLING TERMINATION
50Ω
130Ω
50Ω
1.6k
82Ω
2.7k
130Ω
1.6k
Chip Information
82Ω
2.7k
PECL
INPUTS
PECL
INPUTS
MAX3680A
MAX3680A
MAX3680/
MAX3680/
7