鈥?/div>
All-silicon, low-power CMOS
technology
TTL/CMOS compatible inputs and
outputs
Vapor phase, IR and wave
solderable
Auto-insertable (DIP pkg.)
Low ground bounce noise
Maximum data rate:
50 MBaud
Data rate range:
鹵15%
data
3
廬
delay
devices,
inc.
PACKAGES
RX
N/C
N/C
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VDD
N/C
N/C
N/C
N/C
N/C
DATB
RX
CLK
N/C
GND
1
2
3
4
8
7
6
5
VDD
N/C
N/C
DATB
CLK
N/C
N/C
GND
3D7502M-xxx DIP (.300)
3D7502H-xxx Gull Wing (.300)
3D7502Z-xxx SOIC (.150)
3D7502-xxx
DIP (.300)
3D7502G-xxx Gull Wing (.300)
3D7502D-xxx SOIC (.150)
FUNCTIONAL DESCRIPTION
PIN DESCRIPTIONS
The 3D7502 product family consists of monolithic CMOS Manchester
RX
Signal Input
Decoders. The unit accepts at the RX input a bi-phase-level,
CLK
Signal Output (Clock)
embedded-clock signal. In this encoding mode, a logic one is
DATB Signal Output (Data)
represented by a high-to-low transition within the bit cell, while a logic
VCC +5 Volts
zero is represented by a low-to-high transition. The recovered clock
GND Ground
and data signals are presented on CLK and DATB, respectively, with
the data signal inverted. The operating baud rate (in MBaud) is specified by the dash number. The input
baud rate may vary by as much as
鹵15%
from the nominal device baud rate without compromising the
integrity of the information received.
Because the 3D7502 is not PLL-based, it does not require a long preamble in order to lock onto the
received signal. Rather, the device requires at most one bit cell before the data presented at the output is
valid. This is extremely useful in cases where the information arrives in bursts and the input is otherwise
turned off.
The all-CMOS 3D7502 integrated circuit has been designed as a reliable, economic alternative to hybrid
TTL Manchester Decoders. It is TTL- and CMOS-compatible, capable of driving ten 74LS-type loads. It is
offered in standard 8-pin and 14-pin auto-insertable DIPs and space saving surface mount 8-pin and 14-
pin SOICs.
TABLE 1: PART NUMBER SPECIFICATIONS
PART
NUMBER
3D7502-5
3D7502-10
3D7502-20
3D7502-25
3D7502-30
3D7502-40
3D7502-50
BAUD RATE (MBaud)
Nominal
Minimum Maximum
5.00
10.00
20.00
25.00
30.00
40.00
50.00
4.25
8.50
17.00
21.25
25.50
34.00
42.50
5.75
11.50
23.00
28.75
34.50
46.00
57.50
漏
1997 Data Delay Devices
NOTES: Any baud rate between 5 and 50 MBaud not shown is also available at no extra cost.
Doc #97032
5/19/97
DATA DELAY DEVICES, INC.
3 Mt. Prospect Ave. Clifton, NJ 07013
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