Iron - About mikruhi.

Track: Lame  
Author: Macros, 1aug2001, Kotlas  
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             TTL chips              

  Standard microcircuits of the 7Хxxx series have
there is average consumption and performance
10 ns, their domestic analogues are included in
series K155 and K133. Reduced chips
high consumption of the series7ХLxxxand their analogs
logs from the series K134 also have a reduced
performance (33 ns).  Series 7ХHxxx
(K131), , on the contrary, have an increased
running and power consumption. Micro-
circuits with Schottky diodes (TTLSh) 7ХSxxx (K531)
with higher than standard
consumption have a fast-acting effect of 3
times higher (3 ns).  Series of low-power
microcircuits TTLSH 7ХLSxxx (K555) with the same
performance, the same as the standard one,
consume power several times
less.   The most promising are
series 7ХFxxx (KP1531) with fast
action 3 ns and 7ХALSxxx (KP1533) s
speed 4 ns. At the same time, consumption
the series has ALS  (Advanced Low-Power
Schottky) two times lower than that of the F series
(Fast).  Series ALS  fits well with
chipsCMOS.                       
  Input TTL accepts only logical
signal level.   Switching threshold
usually has a value of about 1.3-1.4 V.
Voltage below this threshold is perceived
appears as a low level, higher - as a high level
juicy.                                   
  Normal output TTL forms output
logical levels: low -below 0.4-0.5
In andhigh - above 2.4 V. Output levels -
neither when the load increases (output current
ka) are getting worse - approaching the threshold
switching  Output ground fault current
limited to units of milliamps, therefore
Ground fault is safe for electrical outputs
copsTTL.Output current during short circuit to the bus
supply when the valve tries to form
low signal level reaches
tens of milliamps and is dangerous for micro-
schemes.                                    
  Open collector output (Open
Drive Output) works as a key,
capable of switching a signal to the bus
GND.  Thus, this type of exit is capable of
capable of forming only low logical
high level,and the high level is formed
using a resistor that pulls up the signal
cash to supply voltage.  Outputs from
open collector allows combining
no, in this case the function "mon-
important I".                               
  Tristable input except for shaping
low and high levelsmaybe
transferred to third, high impedance
state in which the valve is disconnected from
output.  Valves with tristable input
have a control input, which is usually
denote OE (Output Enable).           
  Bidirectional output  element
is a combination of input and
tristable output (or output with
open collector).  Depending on
control signal this pin works
either as an input or an output.            
  Logic elements CMOS differ from
TTL large signal swing (low
level is closer to zero, high - to voltage
power supply), low input currents
(almost zero in statics, in dynamics -
caused by parasitic capacitance) and
low consumption, but they are quickly
the action is somewhat lower. CMOS chips
have the same types of pins, but instead
open collector output is used here
there is an open drain outlet, which
the logic of operation is the same.