
Introduction
1.4 Product Family
Samsung ASIC
1-15
STDM110
STDM110 provides three different sets of output slew rate controls. Only one I/O
slot is required for any slew rate control options.
1.4.4.3
5V Tolerant I/O Buffers
STDM110 I/O library is based on a process which has the most optimum
performance in 1.8V.
In this process, voltage more than 3.6V are not allowed at the gate oxide because
of a reliability problem. And a special circuit is adopted in order to make pin
voltage tolerable up to 5.25V and to offer TTL interface driving up to 3mA.
Obviously, this circuit is constructed not to permit more than 3.6V at the gate
oxide. The external circuit diagram is as follows.
The maximum external tolerance of this buffer is 5.25V. It can be used as a 3.3V
normal buffer.
Figure 1-7.
5V Tolerant I/O Buffers
1.4.4.4 PCI Buffers
PCI buffers are designed for PCI local bus application which is an industry-
standard, high-performance 32bit or 64bit bus architecture. Samsung ASIC
offers input, output, bi-directional PCI buffers for 33MHz and 66MHz operation.
These buffers are compliant with PCI local bus specification 2.1.
1.4.4.5 USB (Universal Serial Bus) Buffers
Various kinds of peripheral equipment such as mouse, joy stick, keyboard,
modem, scanner and printer improve the power of a computer. However, it is not
easy to connect and use them properly in the computer.
USB specification established late in 1995 is a good solution for this problem,
providing facile method of an expansion. Samsung ASIC offers full speed and
low speed USB buffers that complies with Universal Serial Bus specification 1.0,
1.1.
1.4.4.6 Other Buffers
Samsung ASIC can support various kinds of buffers such as HSTL, SSTL, AGP,
PECL, LVDS, and so on. For more information please contact us.
3.3V
3.3V
5.0V
Output voltage
3.3V
Open drain output
5V tolerant input
Tri-state output
Bi-directional I/O
0.25
μ
m 2.5V process
Normal 5V process
TTL Input
TTL Input