184
Digital Electronics
CMOS
I/P
CMOS–
TTL
Interface
TTL
TTL–ECL
Interface
(MC10124)
ECL–TTL
Interface
(MC10125)
ECL
O/P
(a)
ECL
I/P
TTL
CMOS
O/P
(b)
TTL–
CMOS
Interface
Figure 5.65 CMOS-to-ECL and ECL-to-CMOS interfaces.
a logic gate as a reference for defining the complexities of the other digital IC functions. A broadly
accepted definition of different groups of ICs mentioned above is as follows.
A small-scale integration (SSI) chip is one that contains circuitry equivalent in complexity to less
than or equal to 10 logic gates. This category of digital ICs includes basic logic gates and flip-flops.
A medium-scale integration (MSI) chip is one that contains circuitry equivalent in complexity to
10–100 gates. This category of digital ICs includes multiplexers, demultiplexers, counters, registers,
small memories, arithmetic circuits and others. A large-scale integration (LSI) chip is one that contains
circuitry equivalent in complexity to 100–10 000 gates. A very-large-scale integration (VLSI) chip
contains circuitry equivalent in complexity to 10 000–100 000 gates. Large-sized memories and
microprocessors come in the category of LSI and VLSI chips. An ultralarge-scale integration (ULSI)
chip contains circuitry equivalent in complexity to more than 100 000 gates. Very large memories,
larger microprocessors and larger single-chip computers come into this category.
5.14 Application-Relevant Information
Table 5.3 lists the commonly used type numbers of level translator ICs, along with the functional
description. The pin connection diagrams and functional tables for TTL-to-ECL level translator IC type
MC10124 and ECL-to-TTL level translator IC type MC10125 are given in the companion website.
Table 5.3 Functional index of level translators
Type number
Function
10124
Quad TTL-to-ECL translator
10125
Quad ECL-to-TTL translator
10177
Triple ECL-to-CMOS translator
10352
Quad CMOS-to-ECL translator