Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 539-8661
製造零件編號TC74AC164P(F)
BrandToshiba
HK$15.216
/個 (每包:5個)
單位
PDIP Shift Register 8 AC Through Hole - Serial to Parallel 1 14 2 V 5.5 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 756-2836
製造零件編號TC4094BP(N,F)
BrandToshiba
HK$10.284
/個 (每包:5個)
單位
PDIP Shift Register 8 CMOS Through Hole - Serial/Parallel 1 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS庫存編號 171-3324
製造零件編號74VHC163FT
BrandToshiba
HK$0.992
個 (在毎卷:2500)
單位
TSSOP Counter - 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 540-0095
製造零件編號TC74HC595AP(F)
BrandToshiba
HK$9.646
/個 (每包:5個)
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 171-3342
製造零件編號74VHC4020FT
BrandToshiba
HK$1.017
個 (在毎卷:2500)
單位
TSSOP Counter 14 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 171-3445
製造零件編號74VHC595FT
BrandToshiba
HK$1.613
/個 (每包:50個)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 171-3532
製造零件編號74VHC164FT
BrandToshiba
HK$1.328
/個 (每包:50個)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 171-3488
製造零件編號74VHC4040FT
BrandToshiba
HK$2.09
/個 (每包:25個)
單位
TSSOP Counter 12 74VHC Surface Mount Binary - 1 16 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 171-3325
製造零件編號74VHC164FT
BrandToshiba
HK$0.806
個 (在毎卷:2500)
單位
TSSOP Shift Register - 74VHC Surface Mount - Serial to Parallel 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 643-9971
製造零件編號TC74VHC163FT
BrandToshiba
HK$7.25
/個 (每包:5個)
單位
TSSOP Counter 4 VHC Surface Mount Binary Up Counter 1 16 2 V 5.5 V 5.4 x 4.4 x 1mm 5.4mm 4.4mm
RS庫存編號 756-3126
製造零件編號TC74VHC595FT(EL,K)
BrandToshiba
HK$3.676
/個 (每包:5個)
單位
TSSOP Shift Register 3 CMOS Surface Mount - - 1 16 2 V 5.5 V 5.4 x 4.4 x 1mm 5.4mm 4.4mm
RS庫存編號 531-6546
製造零件編號TC4024BF(F)
BrandToshiba
HK$6.21
/個 (每包:10個)
單位
SOP Counter, Divider 7 4000 Surface Mount Binary Up Counter - 14 3 V 18 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS庫存編號 171-3571
製造零件編號74HC164D
BrandToshiba
HK$1.424
/個 (每包:50個)
單位
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 14 2 V 6 V 8.95 x 3.9 x 1.38mm 8.95mm 3.9mm
RS庫存編號 541-9588
製造零件編號TC4020BP(F)
BrandToshiba
HK$9.536
/個 (每包:5個)
單位
PDIP Counter, Divider 14 4000 Through Hole Binary Up Counter 1 16 3 V 18 V 19.75 x 6.4 x 3.5mm 19.75mm 6.4mm
RS庫存編號 171-3455
製造零件編號74VHC393FT
BrandToshiba
HK$2.062
/個 (每包:25個)
單位
TSSOP Counter - 74VHC Surface Mount Binary - 1 14 2 V 5.5 V 5.02 x 4.4 x 1mm 5.02mm 4.4mm
RS庫存編號 171-3005
製造零件編號74HC595D
BrandToshiba
HK$0.973
個 (在毎卷:2500)
單位
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.2 x 3.9 x 1.38mm 10.2mm 3.9mm
RS庫存編號 539-8655
製造零件編號TC74AC163P(F)
BrandToshiba
HK$11.772
/個 (每包:5個)
單位
PDIP Counter 4 AC Through Hole Binary Up Counter 1 16 2 V 5.5 V 19.25 x 6.4 x 3.5mm 19.25mm 6.4mm
RS庫存編號 541-9178
製造零件編號TC74HC4020AF(F)
BrandToshiba
HK$8.384
/個 (每包:5個)
單位
SOP Counter 14 HC Surface Mount Binary Up Counter 1 16 2 V 6 V - 10.8mm 5.3mm
RS庫存編號 601-4033
製造零件編號TC4040BF(F)
BrandToshiba
HK$8.04
/個 (每包:5個)
單位
SOP Counter, Divider 12 4000 Surface Mount Binary Up Counter 1 16 3 V 18 V 10.3 x 5.3 x 1.5mm 10.3mm 5.3mm
RS庫存編號 171-3136
製造零件編號74HC595D
BrandToshiba
HK$2.335
/個 (每包:50個)
單位
SOIC Shift Register - 74HC Surface Mount - Serial to Parallel 1 16 2 V 6 V 10.2 x 3.9 x 1.38mm 10.2mm 3.9mm