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MC74HC7266

Quad 2-Input Exclusive NOR Gate

Motorola => Freescale 

MC74HC7266

APPLICATION INFORMATION

Bi φ–L is defined as biphase–level code. Also known as

Manchester Code, this technique utilizes binary phase shift

keying (PSK). The Bi φ–L output shown in Figure 3 carries

both data and synchronization information; therefore, sepa-

rate data and clock lines are not required to transfer informa-

tion. A positive–going transition in the middle of the bit

interval indicates a logic zero; a negative–going transition in-

dicates a logic one (see Figure 4).

NRZ–L shown in Figure 3 is non–return–to–zero level

code. This is simply serial data out of a shift register, such as

the HC597.

The Bi φ–L signal must be phase coherent (i.e., no

glitches). Therefore, NRZ–L and clock transitions must be

coincident.

NRZ–L

CLOCK

1/4

HC7266

BI φ–L

Figure 3. Biphase–Level Encoder (Manchester Encoder)

NRZ–L

CLOCK

BI φ–L

POSITIVE

LOGIC DATA

1

0

1

1

0

0

BIT

INTERVAL

Figure 4. Timing Diagram

MOTOROLA

4

High–Speed CMOS Logic Data

DL129 — Rev 6

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